Individualism, united with altruism, has become the basis of our western civilization. It is the central doctrine of Christianity ('love your neighbor,' say the Scriptures, not 'love your tribe'); and it is the core of all ethical doctrines which have grown from our civilization and stimulated it. It is also, for instance, Kant's central practical doctrine ("always recognize that human individuals are ends, and do not use them as mere means to your end.")
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Karl Popper, summarizing some of Kant's philosophy, in The Open Society and Its Enemies (1945, p. 102; part of this has sometimes been treated as if it were a direct quote of Kant: Always recognize that human individuals are ends, and do not use them as m