Argument is conclusive, but it does not remove doubt, so that the mind may rest in the sure knowledge of the truth, unless it finds it by the method of experiment. – Roger Bacon
Reasoning draws a conclusion, but does not make the conclusion certain, unless the mind discovers it by the path of experience. – Roger Bacon
For the things of this world cannot be made known without a knowledge of mathematics. – Roger Bacon
All science requires mathematics. The knowledge of mathematical things is almost innate in us. This is the easiest of sciences, a fact which is obvious in that no ones brain rejects it for laymen and people who are utterly illiterate know how to count and reckon. – Roger Bacon