This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...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
s the feeling: “I am in control of my existence” — just as implicitly contained in the experience of pain is the feeling: “I am helpless.” As pleasure emotionally entails a sense of ef...