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
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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...