It has always seemed to me extreme presumptuousness on the part of those who want to make human ability the measure of what nature can and knows how to do, since, when one comes down to it, there is not one effect in nature, no matter how small, that even the most speculative minds can fully understand.

Knowing thyself, that is the greatest wisdom.

With regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them.

Philosophy is written in that great book which ever lies before our eyes — I mean the universe — but we cannot understand it if we do not first learn the language and grasp the symbols, in which it is written.

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

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

The greatest wisdom is to get to know oneself.