This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... women, none of whom meant anything to him — as the ethics of altruism would require. That would be a sacrifice. Here the difference be- tween Objectivism and altruism can be seen most clearly : if sacrifice is the moral principle of action, then that husband should sacrifice his wife for the sake of ten other women. What distinguishes the wife from the ten others? Nothing but her val ue to the husband who has to make the choice — nothing but the fact that his happiness requires her survival.

The Objectivist ethics would tell him: your highest moral purpose is...
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