This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...ation of one’s happiness.

The basic fallacy in the “everyone is selfish” argument consists of an extraordinarily crude equivocation. It is a psychological truism — a tautol
ogy — that all purposeful behavior is motivated. But to equate “ motivated behavior” with “ selfish behavior” is to blank out the distinction between an elementary fact of human psycho logy and the phenomenon of ethical choice. It is to evade the central problem of ethics, namely: by what is man to be motivated?

A genuine selfishness — that is: a genuine concer...
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