This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
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(4) His life and self-esteem require that man take pride in his power to think, pride in his power to live — but morality, men are taught, holds pride, and specifically intellectual pri
de, as the gravest of sins. Virtue begins, men are taught, with humility: with the recognition of the helplessness, the smallness, the impotence of one’s mind.
Is man omniscient?
— demand the mystics. Is he infallible? Then how dare he challenge the word of God, or of God’s representatives, and set himself up as the judge of — anything?