This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... 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
the requirements of survival and of morality — no clash between making himself able to live and making himself worthy of living; he achieves the second by achieving the first. But there is a c...
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