Descartes argues that  “I think, therefore I am.” He claims to have discovered a belief that is certain and irrefutable. Perhaps there is no saying more famous in philosophy than this phrase, often known as the “Cogito” after its Latin phrasing, cogito ergo sum.

However, there is another belief that is also Certain and Irrefutable. Perhaps even more certain that Cogito ergo sum. " Sentio ergo sum"; "I feel, therefore I am".  There is not question that life "feels" and therefore it exists.