Doubt is the origin of wisdom

There is nothing so strange and so unbelievable that it has not been said by one philosopher or another.

It is possible that I am dreaming right now and that all of my perceptions are false.

For I found myself embarrassed with so many doubts and errors that it seemed to me that the effort to instruct myself had no effect other than th eincreasing discovery of my own ignorance

It is to the body alone that we should attribute everything that can be observed in us to oppose our reason.

In order to improve the mind, we ought less to learn, than to contemplate.

If I found any new truths in the sciences, I can say that they follow from, or depend on, five or six principal problems which I succeeded in solving and which I regard as so many battles where the fortunes of war were on my side.