There are four chief obstacles to grasping truth: frail authority, custom, the opinion of the unlearned crowd, and the concealment of ignorance by ostentation.
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"The multitude of students is very great, and the multitude of books is infinite, but the true knowledge is very rare."
"The common people are easily deceived by false appearances."
"The study of logic is necessary, but it is not sufficient for the acquisition of knowledge."
"Many errors have crept into the texts of Aristotle, through the ignorance of translators."
"The true method of philosophy is by experiment and experience."
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