The four greatest stumbling blocks to understanding are: authority, long-standing custom, the sense of the ignorant crowd, and the hiding of one's own ignorance under the show of wisdom.
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"The greater part of the world is ignorant of the true wisdom, and is ruled by error and deception."
"The true wisdom is not to be found in the books of the Latins, but in the books of the Greeks and Arabs."
"There are four chief obstacles to grasping truth: authority, habit, popular opinion, and the concealment of ignorance."
"The Latins have corrupted the texts of the Scriptures, and of the philosophers."
"It is a great shame that Christians neglect the study of languages, which is so necessary for the understanding of the divine law."
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