The joys of theory are the sweetest intellectual pleasures of life

Wherever morality is based on theology, wherever the right is made dependent on divine authority, the most immoral, unjust, infamous things can be justified and established.

I would rather be a devil in alliance with truth, than an angel in alliance with falsehood.

As we expand our knowledge of good books, we shrink the circle of men whose company we appreciate.

The first and highest law must be the love of man to man. Homo homini Deus est - this is the supreme practical maxim, this is the turning point of the world's History.

Only he is a truly ethical, a truly human being, who has the courage to see through his own religious feelings and needs.

This work, though it deals only with eating and drinking, which are regarded in the eyes of our supernaturalistic mock-culture as the lowest acts, is of the greatest philosophic significance and importance... How former philosophers have broken their heads over the question of the bond between body and soul! Now we know, on scientific grounds, what the masses know from long experience, that eating and drinking hold together body and soul, that the searched-for bond is nutrition.