This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... 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 ove reality, that one must never permit oneself contradictions — that one must never attempt to subvert or sabotage the proper function of consciousness.

The proper function of c
onsciousness is: perception, cognition, and the control of action.

An unobstructed consciousness, an integrated consciousness, a thinking consciousness, is a healthy consciousness....
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