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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"Many things are believed on mere custom, without any reason or proof."
"The mathematical sciences are the gate and the key to the understanding of all other sciences."
"The greatest obstacle to progress in science is the blind adherence to authority."
"The study of alchemy is not only useful, but necessary, for the perfection of all other sciences."
"The present generation is so corrupt that it despises the truth, and loves falsehood."
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