"Reasoning draws a conclusion, but does not make the conclusion certain."

"The greater part of the world is ignorant of the true wisdom, and is ruled by error and deception."

"It is better to learn from the infidels than to remain in ignorance."

"The multitude of students is very great, and the multitude of books is infinite, but the true knowledge is very rare."

"He who knows not mathematics cannot know any other sciences."