This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...— and, therefore, that no statistical generalizations are valid in this matter.
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If man is “gray” by nature, no moral concepts are applicable to him, including “grayness,”
and no such thing as morality is possible. But if man has free will, then the fact that ten (or ten million) men made the wrong choice, does not necessitate that the eleventh one will make it;
it necessitates nothing — and proves nothing — in regard to any given individual.
There are many reasons why most people are morally imperfect, i.e., hold mixed, contradictory ...