This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
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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
lash, if man holds the renunciation of this earth as the good, the renunciation of life, of mind, of happiness, of self. Under an anti-life morality, man makes himself worthy of living to the ex...