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

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.

Christianity set itself the goal of fulfilling man’s unattainable desires, but for that very reason ignored his attainable desires. By promising man eternal life, it deprived him of temporal life, by teaching him to trust in God’s help it took away his trust in his own powers; by giving him faith in a better life in heaven, it destroyed his faith in a better life on earth and his striving to attain such a life. Christianity gave man what his imagination desires, but for that very reason failed to give him what he really and truly desires.

You want to be bad, angel? I can teach you every position it comes in

Be careful who you trust, the devil was once an angel.

The essence of faith … is the idea that that which man wishes actually is: he wishes to be immortal, therefore he is immortal; he wishes for the existence of a being who can do everything which is impossible to Nature and reason, therefore such a being exists[.]