Duplicate men are not to be found. There is in each a different balance of desires. Therefore the conditions adapted for the highest enjoyment of one, would not perfectly compass the same end for any other. And consequently the notion of happiness must vary with the disposition and character; that is, must vary indefinitely.
Herbert Spencer, Social Statics: or, The Conditions essential to Happiness specified, and the First of them Developed (London: John Chapman, 1851), Introduction, § 2.
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Herbert Spencer
