This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...cepted the ethics of altruism; he believes that it is immoral to act for his self-interest. That is the principle directing his actions.

Advocates of the “everyone is selfish”
doctrine do not deny that, under the pressure of the altruist ethics, men can knowingly act against their own long-range happiness. They merely assert that in some higher, undefmable sense such men are still acting “selfishly.” A definition of “selfishness” that includes or permits the possibility of knowingly acting against one’s long- range happiness, is a contradiction in ...
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