If man of himself could in a perfect manner know all things visible and invisible, it would indeed be foolish to believe what he does not see. But our manner of knowing is so weak that no philosopher could perfectly investigate the nature of even one little fly.

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Quote text and notes from Wikiquote: Thomas Aquinas (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.