This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... 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 g “happiness” as some undefined, irreducible primary and then attempting to live by its guid- ance. If you achieve that which is the good by a rational standard of value, it will necessarily...
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