In the general theory, neither "matter" nor "form", but only the composite, is a substance.
In the case of man, though the " soul " be proved a reality capable of separate existence, the "body" can in no sense be called a substance in its own right.
This signifies no more than that, in the system of classification and definition shown in the Arbor Porphyriana , man is a substance, corporeal, living, sentient, and rational.
It is a logical definition, having reference to a metaphysical entity.
In the earliest symbols (see the Alexandrian: di ou ta panta egeneto, ta en ouranois kai epi ges, horata te kai aorata , and the Nicene), in the councils (see especially IV Lateran, 1215; "Creator of all things visible and invisible, spiritual and corporeal, who by this omnipotent power . A masterly synthetic exposition of the theological and philosophical doctrine as to man is given in the "Summa Theologica" of St. Either mode would be philosophically tenable, but the Thomistic principle of the successive and graded evolution of forms in matter is in favour of the latter view. The commonly held opinion is that this determination takes place when the organization of the brain of the foetus is sufficiently complete to allow of imaginative life; i.e. But note also the opinion that the creation of, and information by, the soul takes place at the moment of conception.This doctrine &151; the contradiction of Traducianism and Transmigration—follows from the consideration that the formal principle cannot be produced by way of generation, either directly (since it is proved to be simple in substance ), or accidentally (since it is a subsistent form). This problem may be treated from the standpoints of Holy Scripture , theology, or philosophy.Hence there remains only creation as the mode of its production. A The Sacred Writings are entirely concerned with the relations of man to God, and of God's dealings with man, before and after the Fall.The theories of the nature of man so far noticed are purely philosophical.No one of them has been explicitly condemned by the Church.