@dobiapps.com: I think, therefore I am. This is a famous Western philosophical quote, a core assertion by René Descartes. The full Latin phrase is 'Cogito, ergo sum'. It means that the very act of thinking proves my existence. This is a formal philosophical term, rarely used in everyday conversation. The original phrase omits the conjunction 'that', with the full version being 'I think, therefore I am' (the comma is essential). #vocabulary #moviequotes #vocabulary #moviequotes