This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...brotherhood of men. And it will not occur to them, or to anyone, so long as the concept “rational” is omitted from the context of “values,” “desires,” “self-interest” and ethics.
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The Objectivist ethics proudly advocates and upholds rational selfishness — which means: the values required for man’s survival qua man — which means: the values required fo
r human survival — not the values produced by the desires, the emotions, the “aspirations,” the feelings, the whims or the needs of irrational brutes, who have never outgrown the primordia...