You just keep pushing. You just keep pushing. I made every mistake that could be made. But I just kept pushing.

Neither divine grace nor natural knowledge ever diminishes freedom.

Each problem that I solved became a rule, which served afterwards to solve other problems.

There is nothing more ancient than the truth.

Except our own thoughts, there is nothing absolutely in our power.

Everybody thinks himself so well supplied with common sense that even those most difficult to please. . . never desire more of it than they already have.

On the one hand I have a clear and distinct idea of myself, in so far as I am a thinking, non-extended thing; and on the other hand I have a distinct idea of body, in so far a this is simply an extended, non-thinking thing. And, accordingly, it is certain that I am really distinct from my body, and exist without it.