Lucretius believes that there is a difference between the body and the spirit. He believes that both are material, and that the spirit is mortal and separate organ extending throughout the body. We could think of this in terms of the nervous system, in ever part of our body, from head to toe. "Is part of man, no less than hand or foot or eyes are parts of a whole living creature. (Lucretius, pg.69) He believes body and spirit make up one system, both are interconnected, interdependent, one keeps the other alive. "for the two are interlocked by common roots and cannot be torn apart without manifest disaster. As easily could the scent be torn out of lumps of incense without destroying their nature as mind and spirit could be abstracted from the whole body without total dissolution. (Lucretius, pg 75) Thomas Aquinas agrees with this view. He says, you are your soul and you live in your body. A human being is both a soul and a body. Aquinas says, "the soul, which is the first principle of life, is not a body, but the act of a body; thus heat, which is the principle of calefaction, is not a body, but and act of a body." (T. Aquinas, question 75, article 1.)
             Lucretius believes that both the body and soul are material, however, Thomas Aquinas believes that the body is material but the soul is form. He says that form and matter are always found together. Aquinas also says that the human soul is subsistent, in that is operates apart from the body in at least one way, and that is intellect: thinking, free choice and will. It cannot be material because these are not material processes. Aquinas also argues that thinking is abstract, and something material cannot preform an abstract process. Choice and free will are also things that cannot be materialistic processes. Thomas Aquinas does not believe the soul is material. Lucretius' arguments as to why the soul is mortal are, 1- the reason the body mov...