The Twilight of the Idols · Friedrich Wilhelm Nietzsche
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_A Criticism of the Morality of Decadence._—An “altruistic” morality, a morality under which selfishness withers, is in all circumstances a bad sign. This is true of individuals and above all of nations. The best are lacking when selfishness begins to be lacking. Instinctively to select that which is harmful to one, to be _lured_ by “disinterested” motives,—these things almost provide the formula for decadence. “Not to have one’s own interests at heart” —this is simply a moral fig-leaf concealing a very different fact, a physiological one, to wit:—“I no longer know how to find what is to my interest.”... Disintegration of the instincts!—All is up with man when he becomes altruistic.—Instead of saying ingenuously “I am no longer any good,” the lie of morality in the decadent’s mouth says: “Nothing is any good,—life is no good.”—A judgment of this kind ultimately becomes a great danger; for it is infectious, and it soon flourishes on the polluted soil of society with tropical luxuriance, now as a religion (Christianity), anon as a philosophy (Schopenhauerism). In certain circumstances the mere effluvia of such a venomous vegetation, springing as it does out of the very heart of putrefaction, can poison life for thousands and thousands of years.
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