The Twilight of the Idols · Friedrich Wilhelm Nietzsche
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A criticism of the Christian concept of God inevitably leads to the same conclusion.—A nation that still believes in itself, also has its own God. In him it honours the conditions which enable it to remain uppermost,—that is to say, its virtues. It projects its joy over itself, its feeling of power, into a being, to whom it can be thankful for such things. He who is rich, will give of his riches: a proud people requires a God, unto whom it can _sacrifice_ things.... Religion, when restricted to these principles, is a form of gratitude. A man is grateful for his own existence; for this he must have a God.—Such a God must be able to benefit and to injure him, he must be able to act the friend and the foe. He must be esteemed for his good as well as for his evil qualities. The monstrous castration of a God by making him a God only of goodness, would lie beyond the pale of the desires of such a community. The evil God is just as urgently needed as the good God: for a people in such a form of society certainly does not owe its existence to toleration and humaneness....
What would be the good of a God who knew nothing of anger, revenge, envy, scorn, craft, and violence?—who had perhaps never experienced the rapturous _ardeurs_ of victory and of annihilation? No one would understand such a God: why should one possess him?—Of course, when a people is on the road to ruin; when it feels its belief in a future, its hope of freedom vanishing for ever; when it becomes conscious of submission as the most useful quality, and of the virtues of the submissive as self-preservative measures, then its God must also modify himself. He then becomes a tremulous and unassuming sneak; he counsels “peace of the soul,” the cessation of all hatred, leniency and “love” even towards friend and foe. He is for ever moralising, he crawls into the heart of every private virtue, becomes a God for everybody, he retires from active service and becomes a Cosmopolitan.... Formerly he represented a people, the strength of a people, everything aggressive and desirous of power lying concealed in the heart of a nation: now he is merely the good God.... In very truth Gods have no other alternative, they are _either_ the Will to Power—in which case they are always the Gods of whole nations,—or, on the other hand, the incapacity for power—in which case they necessarily become good.
Text from Project Gutenberg, public domain in the United States.