Philosophy is written in that great book which ever lies before our eyes... We cannot understand it if we do not first learn the language and grasp the symbols in which it is written. The book is written in the mathematical language... without whose help it is humanly impossible to comprehend a single word of it, and without which one wanders in vain through a dark labyrinth

In my opinion, nothing occurs contrary to nature except the impossible, and that never occurs

I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.

Doubt is the father of invention

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual

Where the senses fail us, reason must step in

All truths are easy to understand once they are discovered; the point is to discover them.

I have never met a man so ignorant that I couldn't learn something from him.

You cannot teach a man anything; you can only help him find it within himself.