We must say that there are as many squares as there are numbers.

Measure what is measurable, and make measurable what is not so.

If I were again beginning my studies, I would follow the advice of Plato and start with mathematics.

I give infinite thanks to God, who has been pleased to make me the first observer of marvelous things.

Nature is relentless and unchangeable, and it is indifferent as to whether its hidden reasons and actions are understandable to man or not.