This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...ival and well- being. A mind is healthy to the extent that its method of functioning is such as to provide man with the control over reality that the support and fur- therance of his life requir 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...
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