CARTESIAN, adj. Relating to Descartes, a famous philosopher, author of the celebrated dictum, _Cogito ergo sum_--whereby he was pleased to suppose he demonstrated the reality of human existence. The dictum might be improved, however, thus: _Cogito cogito ergo cogito sum_-- "I think that I think, therefore I think that I am;" as close an approach to certainty as any philosopher has yet made.

Endroit: ¶246
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CARTESIAN, adj. Relating to Descartes, a famous philosopher, author of… — The Devil's Dictionary