Descartes is famed by is familiar notion, "I think therefore I am (Cogito, ergo sum.)." It is a conclusion he has reached in his second meditation after much deliberation on the existence of anything certain. After he discovers his ability to doubt and to understand, he is able to substantiate his necessary existence as a consequence. What we doubt or understand may not ultimately correspond, but we can never be uncertain that we are in …showed first 75 words of 782 total…

…showed last 75 words of 782 total…