Faith is essentially intolerant ... essentially because necessarily bound up with faith is the illusion that one's cause is also God's cause.

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

It is not as in the Bible, that God created man in his own image. But, on the contrary, man created God in his own image.

The joys of theory are the sweetest intellectual pleasures of life

If therefore my work is negative, irreligious, atheistic, let it be remembered that atheism — at least in the sense of this work — is the secret of religion itself; that religion itself, not indeed on the surface, but fundamentally, not in intention or according to its own supposition, but in its heart, in its essence, believes in nothing else than the truth and divinity of human nature.

The doctrine of foods is of great ethical and political significance. Food becomes blood, blood becomes heart and brain, thoughts and mind stuff. Human fare is the foundation of human culture and thought. Would you improve a nation? Give it, instead of declamations against sin, better food. Man is what he eats [Der Mensch ist, was er isst].

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.