This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...usion of understanding. One must be willing to repress one’s critical faculty and hold it as one’s guilt; one must be willing to drown any questions that rise in protest — to strangle any trust of reason convulsively seeking to assert its proper function as the pro- tector of one’s life and cognitive integrity.

Remember that all of man’s knowledge and all his co
ncepts have a hierarchical structure. The foundation and starting point of man’s thinking are his sensory perceptions; on this base, man forms his first concepts, then goes on building the edi...
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