This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...fice of his knowledge by identifying and integrating new concepts on a wider and wider scale. If man’s thinking is to be valid, this process must be guided by logic, “the art of noncontradic
tory identification” — and any new concept man forms must be integrated without contradiction into the hierarchical structure of his knowledge. To introduce into one ’s consciousness any i
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...
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