This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...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
ficacy, so pain emotionally entails a sense of impotence.
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Thus, in letting man experience, in his own person, the sense that life is a value and that he is a value, pleasure serves...