My humanity is a constant self-overcoming.

No price is too high to pay for the privilege of owning yourself.

That, however, is - mediocrity, though it be called moderation.

The poison by which the weaker nature is destroyed is strengthening to the strong individual and he does not call it poison.

I conjure you, my brethren, to remain faithful to earth, and do not believe those who speak unto you of super terrestrial hopes! Poisoners they are, whether they know it or not.

Evolution does not make happiness its goal; it aims simply at evolution and nothing else.

Among twelve apostles there must always be one who is as hard as stone, so that the new church may be built upon him.