What is called an acute knowledge of human nature is mostly nothing but the observer's own weaknesses reflected back from others.

Every man gets a narrower and narrower field of knowledge in which he must be an expert in order to compete with other people. The specialist knows more and more about less and less and finally knows everything about nothing.

His priority did not seem to be to teach them what he knew but rather to impress upon them that nothing not even... knowledge was foolproof.

Where all is but dream reasoning and arguments are of no use truth and knowledge nothing.

The utmost extent of man's knowledge is to know that he knows nothing.

Nothing leads so straight to futility as literary ambitions without systematic knowledge.

True knowledge exists in knowing that you know nothing.

All our knowledge begins with the senses proceeds then to the understanding and ends with reason. There is nothing higher than reason.

To know is to know that you know nothing. That is the meaning of true knowledge.

No man can reveal to you nothing but that which already lies half-asleep in the dawning of your knowledge.