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.

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...
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