 Kilwardby is clear in showing that his criticism is aimed at the conception of the soul as a simple form, as he clearly advocates a view of the human being as composite of a plurality of essentially different forms. This view is not incompatible with their making one soul, which is the form of a living thing. In the same way as the body is a unity even though it is constituted by a plurality of parts—foot, hand, blood, bone—each having its own form—the human soul also is constituted by a plurality of parts and nevertheless is a unity. The parts of the body make one body by aggregation.