For what purpose humanity is there should not even concern us: why you are here, that you should ask yourself: and if you have no ready answer, then set for yourself goals, high and noble goals, and perish in pursuit of them!

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.

Humanity unceasingly strives forward from a lower, more partial and obscure understanding of life to one more general and more lucid.

Life is certainly only worthwhile as it represents struggle for worthy causes. There is no struggle in perfect security. I am quite certain that the human being could not continue to exist if he or she had perfect security.

The sole meaning of life is to serve humanity.

A life not lived for others is not a life.