For the religious the holy is truth, for the philosophic the truth is holy.

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.

Man created God in his own image.

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

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.

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.

Man first unconsciously and involuntarily creates God in his own image, and after this God consciously and voluntarily creates man in his own image.