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

The hallmark of this control is self-esteem. Self-esteem is the consequence, expression and reward of a mind fully committed to reason. Reason, the faculty that identifies and i
ntegrates the material provided by the senses, is man’s basic tool of survival. Commitment to reason is commitment to the maintenance of a full intellectual focus, to the constant expansion of one’s understanding and knowledge, to the principle that one’s actions must be consistent with one’s convictions, that one must never attempt to fake reality or place any consideration ab...
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