This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...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.
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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?
pride is not — as the mystics preposterously imply it to be — a pretense at omniscience or infallibility. On the contrary, precisely because man must struggle for knowledge, precisely becaus...