This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...them), so a society (a group of men) needs moral principles in order to organize a social system consonant with man’s nature and with the requirements of his survival.

Just as a
man can evade reality and act on the blind whim of any given moment, but can achieve nothing save progressive self-destruction — so a society can evade reality and establish a system ruled by the blind whims of its members or its leader, by the majority gang of any given moment, by the current demagogue or by a permanent dictator. But such a society can achieve nothing save the rule ...
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