This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...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
as the emotional fuel of man’s existence.
Just as the pleasure-pain mechanism of man’s body works as a barometer of health or injury, so the pleasure-pain mechanism of his con
sciousness works on the same principle, acting as a barometer of what is for him or against him, what is beneficial to his life or inimical. But man is a being of volitional consciousness, he ha...