"I am accustomed to take my sleep for granted, and I often imagine that I dream of the most important things, when after all I am only dreaming."

"It is proper to a philosopher to doubt everything, at least once."

"I think, therefore I am a doubt."

"The chief cause of human error is the confused nature of our perceptions."

"I desire to live, and to continue the studies I have begun, but I have not found anyone who could tell me where to go."