This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...seeks, earns and derives from love.
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A “selfless,” “disinterested” love is a contradiction in terms: it means that one is indifferent to that which one values.
Concern for the welfare of those one loves is a rational part of one’s selfish interests. If a man who is passionately in love with his wife spends a fortune to cure her of a dangerous illnes
s, it would be absurd to claim that he does it as a “sacrifice” for her sake, not his own, and that it makes no difference to him, personally and selfishly, whether she lives or dies.