This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...t is only by means of physical force that one man can deprive another of his life, or enslave him, or rob him, or prevent him from pursuing his own goals, or compel him to act against his own ra tional judgment.

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...
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