"Cogito, ___ sum": Descartes - crossword puzzle clue

Clue: "Cogito, ___ sum": Descartes

"Cogito, ___ sum": Descartes is a crossword puzzle clue that we have spotted 8 times. There are related clues (shown below).

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Recent usage in crossword puzzles:

NY Sun - Jan. 25, 2010
NY Sun - Aug. 30, 2005
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New York Times - Sept. 3, 1980
New York Times - June 11, 1979
New York Times - Feb. 17, 1979