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.

Argument is conclusive, but it does not remove doubt.

A man is crazy who writes a secret in any other way than one which will conceal it from the vulgar.

To ask the proper question is half of knowing.

Reasoning draws a conclusion, but does not make the conclusion certain, unless the mind discovers it by the path of experience.

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 one's brain rejects it; for laymen and people who are utterly illiterate know how to count and reckon.

Cease to be ruled by dogmas and authorities; look at the world!