(3) What kind of parts are they?
(4) Of its division into subjective parts. _______________________
FIRST ARTICLE [III, Q. 90, Art. 1]
Whether Penance Should Be Assigned Any Parts?
Objection 1: It would seem that parts should not be assigned to Penance. For it is the Divine power that works our salvation most secretly in the sacraments. Now the Divine power is one and simple. Therefore Penance, being a sacrament, should have no parts assigned to it.
Obj. 2: Further, Penance is both a virtue and a sacrament. Now no parts are assigned to it as a virtue, since virtue is a habit, which is a simple quality of the mind. In like manner, it seems that parts should not be assigned to Penance as a sacrament, because no parts are assigned to Baptism and the other sacraments. Therefore no parts at all should be assigned to Penance.
Obj. 3: Further, the matter of Penance is sin, as stated above (Q. 84, A. 2). But no parts are assigned to sin. Neither, therefore, should parts be assigned to Penance.
On the contrary, The parts of a thing are those out of which the whole is composed. Now the perfection of Penance is composed of several things, viz. contrition, confession, and satisfaction. Therefore Penance has parts.
I answer that, The parts of a thing are those into which the whole is divided materially, for the parts of a thing are to the whole, what matter is to the form; wherefore the parts are reckoned as a kind of material cause, and the whole as a kind of formal cause (Phys. ii). Accordingly wherever, on the part of matter, we find a kind of plurality, there we shall find a reason for assigning parts.
Now it has been stated above (Q. 84, AA. 2, 3), that, in the sacrament of Penance, human actions stand as matter: and so, since several actions are requisite for the perfection of Penance, viz., contrition, confession, and satisfaction, as we shall show further on (A. 2), it follows that the sacrament of Penance has parts.