This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...gh the state of enjoyment, man experiences the value of life, the sense that life is worth living, worth struggling to maintain. In order to live, man must act to achieve values. Pleasure or enj
oyment is at once an emotional payment for successful action and an incentive to continue acting.
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Further, because of the metaphysical meaning of pleasure to man, the state of enjo
yment gives him a direct experience of his own efficacy, of his competence to deal with the facts of reality, to achieve his values, to live. Implicitly contained in the experience of pleasure i...