Truths are more likely to be discovered by one man than by a nation

Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.

I concluded that I might take as a general rule the principle that all things which we very clearly and obviously conceive are true: only observing, however, that there is some difficulty in rightly determining the objects which we distinctly conceive.

There is a great difference between mind and body insomuch as body is by nature always divisible, and the mind is entirely indivisible.

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

At last I will devote myself sincerely and without reservation to the general demolition of my opinions.

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