---
title: "Best Claude Bernard Quotes"
description: "Claude Bernard was a French physiologist. I. Bernard Cohen of Harvard University called Bernard \"one of the greatest of all men of science\". He originat..."
image: "https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b056/author-claude-bernard-7455.jpg"
---

![Portrait of Claude Bernard](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b056/author-claude-bernard-7455.jpg)

# Claude Bernard

(1813–1878)   Physician Writer

 **91** quotes in **438** categories

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Claude Bernard was a physician writer, best known for *Antonio Lopez-Garcia*.

## Quick Facts About Claude Bernard

Born July 12, 1813

Died February 10, 1878

Profession Physician Writer

Notable works Antonio Lopez-Garcia

## About Claude Bernard

Claude Bernard was a French physiologist. I. Bernard Cohen of Harvard University called Bernard "one of the greatest of all men of science". He originated the term milieu intérieur and the associated concept of homeostasis.

##  Quotes by Claude Bernard · Page 2

> [Experimentation is an active science.](https://sms4smile.com/quotes/claude-bernard/experimentation-is-an-active-science/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Active](https://sms4smile.com/quotes/about/active/)

[Image](https://sms4smile.com/quotes/i/2cd/claude-bernard-7455_active_experimentation-is-an-active-science-171_1714374.png)

> [First causes are outside the realm of science.](https://sms4smile.com/quotes/claude-bernard/first-causes-are-outside-the-realm-of-science/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Accounts](https://sms4smile.com/quotes/about/accounts/)

[Image](https://sms4smile.com/quotes/i/b92/claude-bernard-7455_accounts_first-causes-are-outside-the-realm-of-sc_380359.png)

> [Man can learn nothing except by going from the known to the unknown.](https://sms4smile.com/quotes/claude-bernard/man-can-learn-nothing-except-by-going-from-the-known-to-the-unknown-2/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Education](https://sms4smile.com/quotes/about/education/)

[Image](https://sms4smile.com/quotes/i/230/claude-bernard-7455_education_man-can-learn-nothing-except-by-going-fr_2713815.png)

> [In science, the best precept is to alter and exchange our ideas as fast as science moves ahead.](https://sms4smile.com/quotes/claude-bernard/in-science-the-best-precept-is-to-alter-and-exchange-our-ideas-as/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Ideas](https://sms4smile.com/quotes/about/ideas/)

[Image](https://sms4smile.com/quotes/i/8a2/claude-bernard-7455_ideas_in-science-the-best-precept-is-to-alter_1094313.png)

> [We must never make experiments to confirm our ideas, but simply to control them.](https://sms4smile.com/quotes/claude-bernard/we-must-never-make-experiments-to-confirm-our-ideas-but-simply-to/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Control](https://sms4smile.com/quotes/about/control/)

[Image](https://sms4smile.com/quotes/i/45a/claude-bernard-7455_control_we-must-never-make-experiments-to-confir_2196009.png)

> [Particular facts are never scientific; only generalization can establish science.](https://sms4smile.com/quotes/claude-bernard/particular-facts-are-never-scientific-only-generalization-can/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Facts](https://sms4smile.com/quotes/about/facts/)

[Image](https://sms4smile.com/quotes/i/f66/claude-bernard-7455_facts_particular-facts-are-never-scientific-on_2774286.png)

> [The first requirement in using statistics is that the facts treated shall be reduced to comparable units.](https://sms4smile.com/quotes/claude-bernard/the-first-requirement-in-using-statistics-is-that-the-facts-treated/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Data](https://sms4smile.com/quotes/about/data/)

[Image](https://sms4smile.com/quotes/i/4b4/claude-bernard-7455_data_the-first-requirement-in-using-statistic_584703.png)

> [Those who do not know the torment of the unknown cannot have the joy of discovery.](https://sms4smile.com/quotes/claude-bernard/those-who-do-not-know-the-torment-of-the-unknown-cannot-have-the-joy/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Discovery](https://sms4smile.com/quotes/about/discovery/)

[Image](https://sms4smile.com/quotes/i/ae9/claude-bernard-7455_discovery_those-who-do-not-know-the-torment-of-the_2877910.png)

> [Man can learn nothing unless he proceeds from the known to the unknown.](https://sms4smile.com/quotes/claude-bernard/man-can-learn-nothing-unless-he-proceeds-from-the-known-to-the-unknown/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Education](https://sms4smile.com/quotes/about/education/)

[Image](https://sms4smile.com/quotes/i/ed2/claude-bernard-7455_education_man-can-learn-nothing-unless-he-proceeds_2720716.png)

> [The investigator should have a robust faith - and yet not believe.](https://sms4smile.com/quotes/claude-bernard/the-investigator-should-have-a-robust-faith-and-yet-not-believe/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Believe](https://sms4smile.com/quotes/about/believe/)

[Image](https://sms4smile.com/quotes/i/9bd/claude-bernard-7455_believe_the-investigator-should-have-a-robust-fa_100811.png)

> [Il ne fallait jamais faire des expériences pour confirmer ses idées, mais simplement pour les contrôler. We must never make experiments to…](https://sms4smile.com/quotes/claude-bernard/il-ne-fallait-jamais-faire-des-exp-riences-pour-confirmer-ses-id-es/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Experiments](https://sms4smile.com/quotes/about/experiments/)

[Image](https://sms4smile.com/quotes/i/cac/claude-bernard-7455_experiments_il-ne-fallait-jamais-faire-des-exp-rienc_913978.png)

> [The great experimental principle, then, is doubt, that philosophic doubt which leaves to the mind its freedom and initiative, and from which…](https://sms4smile.com/quotes/claude-bernard/the-great-experimental-principle-then-is-doubt-that-philosophic-doubt/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Doubt](https://sms4smile.com/quotes/about/doubt/)

[Image](https://sms4smile.com/quotes/i/ea5/claude-bernard-7455_doubt_the-great-experimental-principle-then-is_1543071.jpg)

> [The goal of scientific physicians in their own science ... is to reduce the indeterminate. Statistics therefore apply only to cases in…](https://sms4smile.com/quotes/claude-bernard/the-goal-of-scientific-physicians-in-their-own-science-is-to-reduce/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Cases](https://sms4smile.com/quotes/about/cases/)

[Image](https://sms4smile.com/quotes/i/189/claude-bernard-7455_cases_the-goal-of-scientific-physicians-in-the_1282449.png)

> [The fact that knowledge endlessly recedes as the investigator is about to grasp it is what constitutes at the same time his…](https://sms4smile.com/quotes/claude-bernard/the-fact-that-knowledge-endlessly-recedes-as-the-investigator-is/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Facts](https://sms4smile.com/quotes/about/facts/)

[Image](https://sms4smile.com/quotes/i/ddc/claude-bernard-7455_facts_the-fact-that-knowledge-endlessly-recede_328573.png)

> [“The true worth of a researcher lies in pursuing what he did not seek in his experiment as well as what he…](https://sms4smile.com/quotes/claude-bernard/the-true-worth-of-a-researcher-lies-in-pursuing-what-he-did-not-seek/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Research](https://sms4smile.com/quotes/about/research/)

[Image](https://sms4smile.com/quotes/i/001/claude-bernard-7455_research_the-true-worth-of-a-researcher-lies-in-p_462122.png)

> [When we meet a fact which contradicts a prevailing theory, we must accept the fact and abandon the theory, even when the…](https://sms4smile.com/quotes/claude-bernard/when-we-meet-a-fact-which-contradicts-a-prevailing-theory-we-must/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Abandon](https://sms4smile.com/quotes/about/abandon/)

[Image](https://sms4smile.com/quotes/i/272/claude-bernard-7455_abandon_when-we-meet-a-fact-which-contradicts-a_439799.jpg)

> [Science admits no exceptions; otherwise there would be no determinism in science, or rather, there would be no science.](https://sms4smile.com/quotes/claude-bernard/science-admits-no-exceptions-otherwise-there-would-be-no-determinism/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Determinism](https://sms4smile.com/quotes/about/determinism/)

[Image](https://sms4smile.com/quotes/i/351/claude-bernard-7455_determinism_science-admits-no-exceptions-otherwise-t_1989575.png)

> [The stability of the internal medium is a primary condition for the freedom and independence of certain living bodies in relation to…](https://sms4smile.com/quotes/claude-bernard/the-stability-of-the-internal-medium-is-a-primary-condition-for-the/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Body](https://sms4smile.com/quotes/about/body/)

[Image](https://sms4smile.com/quotes/i/83e/claude-bernard-7455_body_the-stability-of-the-internal-medium-is_2080520.png)

> [Effects vary with the conditions which bring them to pass, but laws do not vary. Physiological and pathological states are ruled by…](https://sms4smile.com/quotes/claude-bernard/effects-vary-with-the-conditions-which-bring-them-to-pass-but-laws-do/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Conditions](https://sms4smile.com/quotes/about/conditions/)

[Image](https://sms4smile.com/quotes/i/31f/claude-bernard-7455_conditions_effects-vary-with-the-conditions-which-b_2316782.png)

> [Progress is achieved by exchanging our theories for new ones which go further than the old, until we find one based on…](https://sms4smile.com/quotes/claude-bernard/progress-is-achieved-by-exchanging-our-theories-for-new-ones-which-go/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Exchanging](https://sms4smile.com/quotes/about/exchanging/)

[Image](https://sms4smile.com/quotes/i/282/claude-bernard-7455_exchanging_progress-is-achieved-by-exchanging-our-t_402826.jpg)

> [The first entirely vital action, so termed because it is not effected outside the influence of life, consists in the creation of…](https://sms4smile.com/quotes/claude-bernard/the-first-entirely-vital-action-so-termed-because-it-is-not-effected/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Action](https://sms4smile.com/quotes/about/action/)

[Image](https://sms4smile.com/quotes/i/184/claude-bernard-7455_action_the-first-entirely-vital-action-so-terme_2764745.png)

> [Men who have excessive faith in their theories ... make poor observations, because they choose among the results of their experiments only…](https://sms4smile.com/quotes/claude-bernard/men-who-have-excessive-faith-in-their-theories-make-poor-observations/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Combat](https://sms4smile.com/quotes/about/combat/)

[Image](https://sms4smile.com/quotes/i/280/claude-bernard-7455_combat_men-who-have-excessive-faith-in-their-th_372737.png)

> [Proof that a given condition always precedes or accompanies a phenomenon does not warrant concluding with certainty that a given condition is…](https://sms4smile.com/quotes/claude-bernard/proof-that-a-given-condition-always-precedes-or-accompanies-a/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Accompany](https://sms4smile.com/quotes/about/accompany/)

[Image](https://sms4smile.com/quotes/i/33b/claude-bernard-7455_accompany_proof-that-a-given-condition-always-prec_2985339.png)

> [In a word, I consider hospitals only as the entrance to scientific medicine; they are the first field of observation which a…](https://sms4smile.com/quotes/claude-bernard/in-a-word-i-consider-hospitals-only-as-the-entrance-to-scientific/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Analysis](https://sms4smile.com/quotes/about/analysis/)

[Image](https://sms4smile.com/quotes/i/9da/claude-bernard-7455_analysis_in-a-word-i-consider-hospitals-only-as-t_2266239.jpg)

> [In every enterprise ... the mind is always reasoning, and, even when we seem to act without a motive, an instinctive logic…](https://sms4smile.com/quotes/claude-bernard/in-every-enterprise-the-mind-is-always-reasoning-and-even-when-we/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Business](https://sms4smile.com/quotes/about/business/)

[Image](https://sms4smile.com/quotes/i/fb0/claude-bernard-7455_business_in-every-enterprise-the-mind-is-always-r_23388.jpg)

> [Even mistaken hypotheses and theories are of use in leading to discoveries. This remark is true in all the sciences. The alchemists…](https://sms4smile.com/quotes/claude-bernard/even-mistaken-hypotheses-and-theories-are-of-use-in-leading-to/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Able](https://sms4smile.com/quotes/about/able/)

[Image](https://sms4smile.com/quotes/i/85f/claude-bernard-7455_able_even-mistaken-hypotheses-and-theories-ar_108694.png)

> [But while I accept specialization in the practice, I reject it utterly in the theory of science.](https://sms4smile.com/quotes/claude-bernard/but-while-i-accept-specialization-in-the-practice-i-reject-it-utterly/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Accepting](https://sms4smile.com/quotes/about/accepting/)

[Image](https://sms4smile.com/quotes/i/62a/claude-bernard-7455_accepting_but-while-i-accept-specialization-in-the_329047.png)

> [Science increases our power in proportion as it lowers our pride.](https://sms4smile.com/quotes/claude-bernard/science-increases-our-power-in-proportion-as-it-lowers-our-pride/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Increase](https://sms4smile.com/quotes/about/increase/)

[Image](https://sms4smile.com/quotes/i/a15/claude-bernard-7455_increase_science-increases-our-power-in-proportio_3182734.png)

> [Obervation is a passive science, experimentation is an active science.](https://sms4smile.com/quotes/claude-bernard/obervation-is-a-passive-science-experimentation-is-an-active-science/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Active](https://sms4smile.com/quotes/about/active/)

[Image](https://sms4smile.com/quotes/i/32a/claude-bernard-7455_active_obervation-is-a-passive-science-experime_1720495.png)

> [In the philosophic sense, observation shows and experiment teaches.](https://sms4smile.com/quotes/claude-bernard/in-the-philosophic-sense-observation-shows-and-experiment-teaches/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Experiments](https://sms4smile.com/quotes/about/experiments/)

[Image](https://sms4smile.com/quotes/i/6ce/claude-bernard-7455_experiments_in-the-philosophic-sense-observation-sho_1947173.png)

> [The joy of discovery is certainly the liveliest that the mind of man can ever feel.](https://sms4smile.com/quotes/claude-bernard/the-joy-of-discovery-is-certainly-the-liveliest-that-the-mind-of-man/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Desire for knowledge](https://sms4smile.com/quotes/about/desire-for-knowledge/)

[Image](https://sms4smile.com/quotes/i/e44/claude-bernard-7455_desire-for-knowledge_the-joy-of-discovery-is-certainly-the-li_2901436.png)

> [A discovery is generally an unforeseen relation not included in theory.](https://sms4smile.com/quotes/claude-bernard/a-discovery-is-generally-an-unforeseen-relation-not-included-in-theory/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Discovery](https://sms4smile.com/quotes/about/discovery/)

[Image](https://sms4smile.com/quotes/i/dde/claude-bernard-7455_discovery_a-discovery-is-generally-an-unforeseen-r_1336421.png)

> [We must keep our freedom of mind, ... and must believe that in nature what is absurd, according to our theories, is…](https://sms4smile.com/quotes/claude-bernard/we-must-keep-our-freedom-of-mind-and-must-believe-that-in-nature-what/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Absurd](https://sms4smile.com/quotes/about/absurd/)

[Image](https://sms4smile.com/quotes/i/48b/claude-bernard-7455_absurd_we-must-keep-our-freedom-of-mind-and-mus_462409.png)

> [Well-observed facts, though brought to light by passing theories, will never die; they are the material on which alone the house of…](https://sms4smile.com/quotes/claude-bernard/well-observed-facts-though-brought-to-light-by-passing-theories-will/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Accounts](https://sms4smile.com/quotes/about/accounts/)

[Image](https://sms4smile.com/quotes/i/33c/claude-bernard-7455_accounts_well-observed-facts-though-brought-to-li_2194821.png)

> [The mental never influences the physical. It is always the physical that modifies the mental, and when we think that the mind…](https://sms4smile.com/quotes/claude-bernard/the-mental-never-influences-the-physical-it-is-always-the-physical/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Diseased](https://sms4smile.com/quotes/about/diseased/)

[Image](https://sms4smile.com/quotes/i/8e2/claude-bernard-7455_diseased_the-mental-never-influences-the-physical_673665.png)

> [The eloquence of a scientist is clarity; scientific truth is always more luminous when its beauty is unadorned than when it is…](https://sms4smile.com/quotes/claude-bernard/the-eloquence-of-a-scientist-is-clarity-scientific-truth-is-always/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Beauty](https://sms4smile.com/quotes/about/beauty/)

[Image](https://sms4smile.com/quotes/i/54d/claude-bernard-7455_beauty_the-eloquence-of-a-scientist-is-clarity_1303737.png)

> [A great discovery is a fact whose appearance in science gives rise to shining ideas, whose light dispels many obscurities and shows…](https://sms4smile.com/quotes/claude-bernard/a-great-discovery-is-a-fact-whose-appearance-in-science-gives-rise-to/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Appearance](https://sms4smile.com/quotes/about/appearance/)

[Image](https://sms4smile.com/quotes/i/a7d/claude-bernard-7455_appearance_a-great-discovery-is-a-fact-whose-appear_1096261.png)

> [A contemporary poet has characterized this sense of the personality of art and of the impersonality of science in these words,-'Art is…](https://sms4smile.com/quotes/claude-bernard/a-contemporary-poet-has-characterized-this-sense-of-the-personality/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Accounts](https://sms4smile.com/quotes/about/accounts/)

[Image](https://sms4smile.com/quotes/i/887/claude-bernard-7455_accounts_a-contemporary-poet-has-characterized-th_458648.png)

> [We must remain, in a word, in an intellectual disposition which seems paradoxical, but which, in my opinion, represents the true mind…](https://sms4smile.com/quotes/claude-bernard/we-must-remain-in-a-word-in-an-intellectual-disposition-which-seems/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Belief](https://sms4smile.com/quotes/about/belief/)

[Image](https://sms4smile.com/quotes/i/24c/claude-bernard-7455_belief_we-must-remain-in-a-word-in-an-intellect_321555.png)

> [Now, a living organism is nothing but a wonderful machine endowed with the most marvellous properties and set going by means of…](https://sms4smile.com/quotes/claude-bernard/now-a-living-organism-is-nothing-but-a-wonderful-machine-endowed-with/)

[Claude Bernard](https://sms4smile.com/quotes/author/claude-bernard/)

[Biochemistry](https://sms4smile.com/quotes/about/biochemistry/)

[Image](https://sms4smile.com/quotes/i/b61/claude-bernard-7455_biochemistry_now-a-living-organism-is-nothing-but-a-w_668912.jpg)

## Claude Bernard by topic

[Science (70)](https://sms4smile.com/quotes/about/science/claude-bernard/) [Theory (16)](https://sms4smile.com/quotes/about/theory/claude-bernard/) [Research (16)](https://sms4smile.com/quotes/about/research/claude-bernard/) [Men (16)](https://sms4smile.com/quotes/about/men/claude-bernard/) [Facts (15)](https://sms4smile.com/quotes/about/facts/claude-bernard/) [Experiments (14)](https://sms4smile.com/quotes/about/experiments/claude-bernard/) [Observation (13)](https://sms4smile.com/quotes/about/observation/claude-bernard/) [Mind (13)](https://sms4smile.com/quotes/about/mind/claude-bernard/) [Ideas (13)](https://sms4smile.com/quotes/about/ideas/claude-bernard/) [Discovery (12)](https://sms4smile.com/quotes/about/discovery/claude-bernard/) [Psychology (10)](https://sms4smile.com/quotes/about/psychology/claude-bernard/)

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                        "text": "The first entirely vital action, so termed because it is not effected outside the influence of life, consists in the creation of the glycogenic material in the living hepatic tissue. The second entirely chemical action, which can be effected outside the influence of life, consists in the transformation of the glycogenic material into sugar by means of a ferment.",
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