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Knowledge is sometimes superfluous: when we need it, we have it not.

Knowledge is of no value unless you put it into practice.

Knowledge is knowing that we cannot know.

Knowledge has to be improved, challenged, and increased constantly, or it vanishes.

Knowledge is invariably a matter of degree: you cannot put your finger upon even the simplest datum and say this we know.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.

Knowledge of what is does not open the door directly to what should be.

Knowledge is not simply another commodity. On the contrary. Knowledge is never used up. It increases by diffusion and grows by dispersion.

Even knowledge has to be in the fashion, and where it is not, it is wise to affect ignorance.

Far more crucial than what we know or do not know is what we do not want to know.