This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... not by the grace of the supernatural nor of your neighbors nor of your whims, but by the grace of reality and the nature of life.

I quote from Galt’s speech: “Man has been cal
led a rational being, but rationality is a matter of choice — and the alternative his nature offers him is: rational being or suicidal animal. Man has to be man — by choice; he has to hold h is life as a value — by choice; he has to leam to sustain it — by choice; he has to discover the values it requires and practice his virtues — by choice. A code of values accepted by choic...
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