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.
Cogito ergo sum
Meditations on First Philosophy, Meditation III
1641
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"It is proper to a philosopher to doubt everything, at least once."
Controversial"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."
Controversial"The greatest good is that which is most useful."
Strange & Unusual"I entirely abandoned the study of letters, resolving to seek no other science than that which could be found in myself, or at least in the great book of the world."
Shocking"It is not enough to possess a good mind; one must make good use of it."
Controversial