This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...dea that cannot be so integrated, an idea not derived from reality, not validated by a process of reason, not subject to rational examination or judgment — and worse : an idea that clashes wit h the rest of one’s concepts and understanding of reality — is to sabotage the integrative function of consciousness, to undercut the rest of one’s convictions and kill one’s capacity to be certain of anything. This is the meaning of John Galt’s statement in Atlas Shrugged that “the alleged shortcut to knowledge, which is faith, is only a short circuit destroying the mind.�...
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