Source: New Republic
July 6, 2006
In First Meditation René Descartes asks himself how he would know that "the sky, the air, the earth, colors, figures, sounds, and all external things, are nothing better than the illusions of dreams." How can we really know, Descartes asks, whether what we see is real or a hallucination? Descartes finally evokes God to connect himself to the outside world, but subsequent philosophers, including George Berkeley and David Hume, doubted whether the connection could be made with any certai