The Twilight of the Idols · Friedrich Wilhelm Nietzsche
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I will formulate a principle. All naturalism in morality—that is to say, every sound morality is ruled by a life instinct,—any one of the laws of life is fulfilled by the definite canon “thou shalt,” “thou shalt not,” and any sort of obstacle or hostile element in the road of life is thus cleared away. Conversely, the morality which is antagonistic to nature—that is to say, almost every morality that has been taught, honoured and preached hitherto, is directed precisely against the life-instincts,—it is a condemnation, now secret, now blatant and impudent, of these very instincts. Inasmuch as it says “God sees into the heart of man,” it says Nay to the profoundest and most superior desires of life and takes God as the enemy of life. The saint in whom God is well pleased, is the ideal eunuch. Life terminates where the “Kingdom of God” begins.
Text from Project Gutenberg, public domain in the United States.