This man described a tree
This man described a tree of philosophy with metaphysics as the roots, physics as the trunk and other sciences as the branches. He believed that the essence of mind is thought, while the essence of the body is extension. This man argued that sensations are involuntary to the mind and therefore must have an external source, and a world external to the mind must exist. Since everything taken to be true is given by the senses, this philosopher began one work by rejecting everything in order to find true knowledge. For 10 points, name this author of Discourse on the Method and Meditations on First Philosophy, a French philosopher who asserted, "I think, therefore I am."
This man described a tree of philosophy with metaphysics as the roots, physics as the trunk and other sciences as the branches.