This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
... Objectivist Ethics, I shall begin by quoting its best representative — John Galt, in Atlas Shrugged :
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“Through centuries of scourges and disasters, brought about by your code
of morality, you have cried that your code had been broken, that the scourges were punishment for breaking it, that men were too weak and too selfish to spill all the blood it required. You damn
ed man, you damned existence, you damned this earth, but never dared to question your code. ... You went on crying that your code was noble, but human nature was not good enough to practice it. ...