Answer: cogito

AnswerCrossword Clue
COGITODescartes' hypothesis
COGITOPhilosophical opening
COGITOLiterally, "I think"
COGITODescartes opening
COGITO"... ergo sum"
COGITOStart of a Descartes declaration
COGITO... ergo sum (I think, therefore I am): Lat.
COGITOStart of a line ending in a sum?
COGITO"Ergo" preceder
COGITOStart of Descartes' phrase
COGITOEpistemological principle, familiarly
COGITOBeginning that leads to a sum?
cogitoa philosophical principle
cogitothe philosophic principle that one's existence is demonstrated by the fact that one thinks