This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...t choose either to be virtuous or to be happy, to be idealistic or to be successful, but they cannot be both. This view establishes a disastrous conflict on the deepest level of man’s being, a lethal dichotomy that tears man apart: it forces him to choose between making himself able to live and making himself worthy of living. Yet self-esteem and mental health require that he achieve both.

If man holds life on earth as the good, if he judges his values by the standard of that which is proper to the existence of a rational being, then there is no clash between ...
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