This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...that which one knows to be evil. In morality, “black” is predominantly the result of attempting to pretend to oneself that one is merely “gray.”

If a moral code (such as al
truism) is, in fact, impossible to practice, it is the code that must be condemned as “black,” not its victims evaluated as “gray.” If a moral code prescribes irreconcilable contradictio ns — so that by choosing the good in one respect, a man becomes evil in another — it is the code that must be rejected as “black.” If a moral code is inapplicable to reality — if it of...
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