Cogito ergo sum 나는 생각한다, 고로 존재한다 René Descartes (1596–1650) Philosophy Portal "Cogito, ergo sum" (Latin: "I think, therefore I am") or Dubito, ergo cogito, ergo sum (Latin: "I doubt, therefore I think, therefore I am") is a philosophical statement used by René Descartes, which became a foundational element of Western philosophy. Descartes's origin..