This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand his self-interest; one cannot be concerned with or desire that of which one has no knowledge.

Selfishness entails: (a) a hierarchy of values set by the standard of one’s self-
interest, and (b) the refusal to sacrifice a higher value to a lower one or to a nonvalue.

A genuinely selfish man knows that only reason can determine what is, in fact, to his sel
f-interest, that to pursue contradictions or attempt to act in defiance of the facts of reality is self-destructive — and self-destruction is not to his self-interest. “To think, is to man�...
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