This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
... Existentially, the activity of pursuing rational goals is the activity of maintaining one’s life; psychologically, its result, reward and concomitant is an emotional state of happiness. It is
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.
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But the relationship of...