This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
... was the pattern of a civilized society which — for the brief span of some hundred and fifty years — America came close to achieving. A civilized society is one in which physical force is ba
nned from human relationships — in which the government, acting as a policeman, may use force only in retaliation and only against those who initiate its use.
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This was the essent
ial meaning and intent of America’s political philosophy, implicit in the principle of individual rights. But it was not formulated explicitly, nor fully accepted nor consistently practiced. <...