This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... by experiencing happiness that one lives one’s life, in any hour, year or the whole of it. And when one experiences the kind of pure happiness that is an end in itself — the kind that makes one think: “This is worth living for” — what one is greeting and affirming in emotional terms is the metaphysical fact that life is an end in itself.

But the relationship of
cause to effect cannot be reversed. It is only by accepting “man’s life” as one’s primary and by pursuing the rational values it requires that one can achieve happiness — not by takin...
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