Descartes said, “I think, therefore I am” and fell into the trap of denying reality. The place to run to escape skepticism is not our own minds…but straight into a tree to remind ourselves that, whatever our fancy to the contrary, the real world outside our minds has been factually solid all along. The proper and natural treatment for those inclined to think themselves into a corner is not to go into a corner and think but to run out into the fields to grasp and be grasped by reality.” Descartes would have been better off to say, “I am, therefore I can think.” Our thinking depends on reality. Reality does not depend on our thinking.
Benjamin Wiker, paraphrashe