A poet is not an apostle; he drives out devils only by the power of the devil.

A genius may perhaps be a century ahead of his age and hence stands there as a paradox, but in the end, the race will assimilate what was once a paradox, so it is no longer paradoxical.

It is intelligent to ask two questions: (1) Is it possible? (2) Can I do it?. But it is unintelligent to ask these questions: (1) Is it real? (2) Has my neighbor done it?

How absurd men are! They never use the liberties they have, they demand those they do not have. They have freedom of thought, they demand freedom of speech.

To be a teacher does not mean simply to affirm that such a thing is so, or to deliver a lecture, etc.

It is the duty of the human understanding to understand that there are things which it cannot understand, and what those things are. Human understanding has vulgarly occupied itself with nothing but understanding, but if it would only take the trouble to understand itself at the same time it would simply have to posit the paradox.

In a mathematical proposition, for example, the objectivity is given, but therefore its truth is also an indifferent truth.