The earth, in fair and grateful exchange, pays back to the moon an illumination similar to that which it receives from her throughout nearly all the darkest gloom of the night.

One can understand nature only when one has learned the language and the signs in which it speaks to us; but this language is mathematics and these signs are methematical figures.

It is surely harmful to souls to make it a heresy to believe what is proved.

Science proceeds more by what it has learned to ignore than what it takes into account.

Nothing can be taught to a man, only it's possibly to help him to discover it inside.

They who depend upon manifest observations will philosophize better than those who persist in opinions repugnant to the senses.

In time you may discover everything that can be discovered, and still your progress will only be progress away from humanity. The distance between you and them can one day become so great that your joyous cry over some new gain could be answered by an universal shriek of horror.