Abstract

This chapter discusses Descartes thoughts on the seat of the soul or that part of the body which the soul is directly and intimately united. Descartes explains the simplicity principle: If the soul is simple, or indivisible, it can interact directly with only one object at once, thus indivisible. For example, if an animal's heart is taken and cut into pieces, the soul's indivisibility means that the soul cannot act directly upon the dissected parts of the heart. Descartes also consistently identified the pineal gland as the seat of the soul— partly because it was mobile, durable, protected from outside influence, and accessible to the nerves. It also explains that the mind is not affected by all parts of the body, but only the brain and one small part of the brain only where a certain part of the brain is affected while other parts are doing other things. This chapter finally reveals that the simplicity principle of Descartes will have strong difficulties in the final analysis in relation to the truth of God.