"The common way of teaching is rather for ostentation than for instruction."

"The true wisdom is not to be found in the books of the Latins, but in the books of the Greeks and Arabs."

"It is impossible for the human mind to attain to the perfect truth in anything, unless it be aided by the grace of God."

"Many things are held to be true which are false, and many things are held to be false which are true."

"The common way of studying is rather for the sake of reputation than for the sake of knowledge."