This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...ional man, the man who desires nothing but rational goals, seeks nothing but rational values and finds his joy in nothing but rational actions.”

The maintenance of life and the p
ursuit of happiness are not two separate issues. To hold one’s own life as one’s ultimate value, and one’s own happiness as one’s highest purpose are two aspects of the same achievement. Existentially, the activity of pursuing rational goals is the activity of maintaining one’s life; psychologically, its result, reward and concomitant is an emotional state of happiness. It is...
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