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

The long chains of simple and easy reasonings by means of which geometers are accustomed to reach the conclusions of their most difficult demonstrations, had l…

One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.

The last rule was to make enumerations so complete, and reviews so comprehensive, that I should be certain of omitting nothing.

I don't think most people associate me with leeches or how to get them off. But I know how to get them off. I'm an expert at it.

Y'see, when you start to lick a national problem you have to go after the fundamentables. You want to cut down air pollution? Cut down the original source... B…

If we can see our difficulties, there is a way of resolving them, or the hope of a way.