I answer that, As stated above (A. 3), Christ had a twofold power in the sacraments. One was the power of authority, which belongs to Him as God: and this power He could not communicate to any creature; just as neither could He communicate the Divine Essence. The other was the power of excellence, which belongs to Him as man. This power He could communicate to ministers; namely, by giving them such a fulness of grace—that their merits would conduce to the sacramental effect—that by the invocation of their names, the sacraments would be sanctified—and that they themselves might institute sacraments, and by their mere will confer the sacramental effect without observing the sacramental rite. For a united instrument, the more powerful it is, is all the more able to lend its power to the separated instrument; as the hand can to a stick.
Reply Obj. 1: It was not through jealousy that Christ refrained from communicating to ministers His power of excellence, but for the good of the faithful; lest they should put their trust in men, and lest there should be various kinds of sacraments, giving rise to division in the Church; as may be seen in those who said: "I am of Paul, I am of Apollo, and I of Cephas" (1 Cor. 1:12).
Reply Obj. 2: This objection is true of the power of authority, which belongs to Christ as God. At the same time the power of excellence can be called authority in comparison to other ministers. Whence on 1 Cor. 1:13: "Is Christ divided?" the gloss says that "He could give power of authority in baptizing, to those to whom He gave the power of administering it."
Reply Obj. 3: It was in order to avoid the incongruity of many heads in the Church, that Christ was unwilling to communicate to ministers His power of excellence. If, however, He had done so, He would have been Head in chief; the others in subjection to Him. _______________________
FIFTH ARTICLE [III, Q. 64, Art. 5]
Whether the Sacraments Can Be Conferred by Evil Ministers?
Objection 1: It seems that the sacraments cannot be conferred by evil ministers. For the sacraments of the New Law are ordained for the purpose of cleansing from sin and for the bestowal of grace. Now evil men, being themselves unclean, cannot cleanse others from sin, according to Ecclus. 34:4: "Who [Vulg.: 'What'] can be made clean by the unclean?" Moreover, since they have not grace, it seems that they cannot give grace, for "no one gives what he has not." It seems, therefore, that the sacraments cannot be conferred by wicked men.
Obj. 2: Further, all the power of the sacraments is derived from Christ, as stated above (A. 3; Q. 62, A. 5). But evil men are cut off from Christ: because they have not charity, by which the members are united to their Head, according to 1 John 4:16: "He that abideth in charity, abideth in God, and God in him." Therefore it seems that the sacraments cannot be conferred by evil men.
Obj. 3: Further, if anything is wanting that is required for the sacraments, the sacrament is invalid; for instance, if the required matter or form be wanting. But the minister required for a sacrament is one who is without the stain of sin, according to Lev. 21:17, 18: "Whosoever of thy seed throughout their families, hath a blemish, he shall not offer bread to his God, neither shall he approach to minister to Him." Therefore it seems that if the minister be wicked, the sacrament has no effect.
On the contrary, Augustine says on John 1:33: "He upon Whom thou shalt see the Spirit," etc. (Tract. v in Joan.), that "John did not know that our Lord, having the authority of baptizing, would keep it to Himself, but that the ministry would certainly pass to both good and evil men . . . What is a bad minister to thee, where the Lord is good?"