"There is one basis of science," says Descartes, "one test…
“"There is one basis of science," says Descartes, "one test and rule of truth, namely, that whatever is clearly and distinctly conceived is true." A profound psychological mistake. It is true only of formal logic, wherein the mind never quits the sphere of its first assumptions to pass out into the sphere of real existences; no sooner does the mind pass from the internal order to the external order, than the necessity of verifying the strict correspondence between the two becomes absolute. The Ideal Test must be supplemented by the Real Test, to suit the new conditions of the problem.”
About This Quote
This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.
Descartes' claim that clear and distinct ideas guarantee truth applies only to formal logic, not to empirical reality; we must also verify ideas against the external world.
In simple terms: Clear ideas are true only in logic, not in real life.
Key Takeaway
Test ideas against real-world evidence.
Themes
philosophy
epistemology
science
logic
Mood
critical
inquisitive
Type
analytical
philosophical
When to use this quote
- scientific research
- policy making
- everyday decision making
- critical thinking
Key Concepts
Cartesian doubt
empiricism
verification
correspondence theory
Questions to Reflect On
- How do you ensure your assumptions match reality?
- When might clear reasoning mislead you?
A Different Perspective
Pure logical certainty cannot replace empirical validation.