Descartes Second Meditation Descartes's Second Meditation discusses how a "body" can perceive things, such as objects. Perception is vital to his first theory that "[he] thinks, therefore [he] is." In order to prove his conclusion; he goes through a series of premises, or arguments, that lead him to his final conclusion. In order to reach this conclusion, he uses a process of elimination. In Descartes's final premise, he uses the idea that in order to perceive something you must have a concept of it. Therefore, I'm arguing that the final premise is flawed, in that through this concept, he is going against some of his very own idea