This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand him.

(December 1962)

12. Man’s Rights

by Ayn Rand

If one wishes to advocate a free society — that is, capitali
sm — one must realize that its indispensable foundation is the principle of individual rights. If one wishes to uphold individual rights, one must realize that capitalism is the only system th at can uphold and protect them. And if one wishes to gauge the relationship of freedom to the goals of today’s intellectuals, one may gauge it by the fact that the concept of individual rights...
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