Learning does not consist only of knowing what we must or we can do, but also of knowing what we could do and perhaps should not do.
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
Art is the uniting of the subjective with the objective, of nature with reason, of the unconscious with the conscious, and therefore art is the highest means of knowledge.
Wisdom is not communicable. The wisdom which a wise man tries to communicate always sounds foolish… Knowledge can be communicated, but not wisdom. One can find it, live it, do wonders through it, but one cannot communicate and teach it.
When intelligent and sensible people despise knowledge in their old age, it is only because they have asked too much of it and of themselves.
When a man has special knowledge and special powers like my own, it rather encourages him to seek a complex explanation when a simpler one is at hand.
We do not need to be shoemakers to know if our shoes fit, and just as little have we any need to be professionals to acquire knowledge of matters of universal interest.