"Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it."

"I suppose therefore that all the things I see are false imaginations; I believe that nothing ever existed of all that my fallacious memory represents to me."

"I can easily conceive that there is nothing in the world, that there is no heaven, no earth, no minds, no bodies; is it not then likewise true that I do not exist?"

"I concluded that I was a substance whose whole essence or nature consists in thinking, and whose being does not depend on any place or any material thing."

"It is precisely because I am in the habit of using my senses to think of things that I find it difficult to think of anything else."