I find it difficult to believe that I belong to such an idiotic, rotten species - the species that actually boasts of its freedom of will, heroism on command, senseless violence, and all of the loathsome nonsense that goes by the name of patriotism.

Everyone has two choices. We're either full of love... or full of fear.

It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.

It is also a natural thing for a serious young man that he should form for himself as precise an idea as possible of the goal of his desires.

One must not attempt to justify them, but rather to sense their nature simply and clearly.

Curiosity has its own reason for existence.

Truth is what stands the test of experience.