Galileu Galilei

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

Mathematics is the language with which God has written the universe.

I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.

Long experience has taught me this about the status of mankind with regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them, while on the other hand to know and understand a multitude of things renders men cautious in passing judgement upon anything new.

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

The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do.

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

Eppur si muove.

Philosophy is written in that great book which ever lies before our eyes—I mean the universe … This book is written in mathematical language and its characters are triangles, circles and other geometrical figures, without whose help … one wanders in vain through a dark labyrinth.