As Carl Sagan said, “Observation: I can’t see a thing…

The young man [Turgot] destined for an ecclesiastical career was placed within walls carefully designed to keep out all currents of new thought; his…

— Andrew Dickson White

We ought to observe that practice which is the hardest of all-especially for young physicians-we ought to throw in no medicine at all-to abstain-to…

— John Randolph of Roanoke

Observation and theory get on best when they are mixed together, both helping one another in the pursuit of truth. It is a good…

— Arthur Eddington

Biochemists and biologists who adhere blindly to the Darwinism theory search for results that will be in agreement with their theories and consequently orient…

— Pierre-Paul Grasse

We know nothing of the principle of health, the positive of which pathology is the negative, except from observation and experience. And nothing but…

— Florence Nightingale

No theory about our bodies as mere objects of observation and calculation (as distinct from partners in communicative interaction, assumed to be free) can…

— Allen W. Wood

But what is of great importance to me is observation of the movement of colors.

— Robert Delaunay

“The person who can learn by observation can create his own culture.”

— Santosh Kalwar

There are few defects in our nature so glaring as not to be veiled from observation by politeness and good-breeding.

— Stanisław I Leszczyński

The observation of the way in which the children pass from the first disordered movements to those which are spontaneous and ordered -- this…

— Maria Montessori

Science has to be understood in its broadest sense, as a method for apprehending all observable reality, and not merely as an instrument for…

— Alexis Carrel

I think that for thousands of years people have made the observation that there are certain kinds of extreme depressive states that seem to…

— Kay Redfield Jamison

That human life must be some kind of mistake is sufficiently proved by the simple observation that man is a compound of needs which…

— Arthur Schopenhauer

“There was an omnivorous intellect that won him the family sobriquet of Walking Encyclopedia.”

— Eric Liu

The impulse to paint comes neither from observation nor from the soul (which is probably blind) but from an encounter: the encounter between painter…

— John Berger