This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
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The precondition of a civilized society is the barring of physical force from social relationships — thus establishing the principle that if men wish to deal wit
h one another, they may do so only by means of reason : by discussion, persuasion and voluntary, uncoerced agreement.
The necessary consequence of man’s right to life is his righ
t to self- defense. In a civilized society, force may be used only in retaliation and only against those who initiate its use. All the reasons which make the initiation of physical force an evil...