I answer that, The spiritual healing, which is given at the end of life, ought to be complete, since there is no other to follow; it ought also to be gentle, lest hope, of which the dying stand in utmost need, be shattered rather than fostered. Now oil has a softening effect, it penetrates to the very heart of a thing, and spreads over it. Hence, in both the foregoing respects, it is a suitable matter for this sacrament. And since oil is, above all, the name of the liquid extract of olives, for other liquids are only called oil from their likeness to it, it follows that olive oil is the matter which should be employed in this sacrament.
Reply to Objection 1: The incorruption of glory is something not contained in this sacrament: and there is no need for the matter to signify such a thing. Hence it is not necessary for balsam to be included in the matter of this sacrament, because on account of its fragrance it is indicative of a good name, which is no longer necessary, for its own sake, to those who are dying; they need only a clear conscience which is signified by oil.
Reply to Objection 2: Wine heals by its roughness, oil by its softness, wherefore healing with wine pertains to Penance rather than to this sacrament.
Reply to Objection 3: Though olive oil is not produced everywhere, yet it can easily be transported from one place to another. Moreover this sacrament is not so necessary that the dying cannot obtain salvation without it.
Whether the oil ought to be consecrated?
Objection 1: It would seem that the oil need not be consecrated. Because there is a sanctification in the use of this sacrament, through the form of words. Therefore another sanctification is superfluous if it be applied to the matter.
Objection 2: Further, the efficacy and signification of the sacraments are in their very matter. But the signification of the effect of this sacrament, is suitable to oil on account of its natural properties, and the efficacy thereof is due to the Divine institution. Therefore its matter does not need to be sanctified.
Objection 3: Further, Baptism is a more perfect sacrament than Extreme Unction. But, so far as the essentials of the sacrament are concerned, the baptismal matter needs no sanctification. Neither therefore does the matter of Extreme Unction need to be sanctified.
On the contrary, In all other anointings the matter is previously consecrated. Therefore since this sacrament is an anointing, it requires consecrated matter.
I answer that, Some hold that mere oil is the matter of this sacrament, and that the sacrament itself is perfected in the consecration of the oil by the bishop. But this is clearly false since we proved when treating of the Eucharist that that sacrament alone consists in the consecration of the matter (Q[2], A[1], ad 2).
We must therefore say that this sacrament consists in the anointing itself, just as Baptism consists in the washing, and that the matter of this sacrament is consecrated oil. Three reasons may be assigned why consecrated matter is needed in this sacrament and in certain others. The first is that all sacramental efficacy is derived from Christ: wherefore those sacraments which He Himself used, derived their efficacy from His use of them, even as, by the contact of His flesh, He bestowed the force of regeneration on the waters. But He did not use this sacrament, nor any bodily anointing, wherefore in all anointings a consecrated matter is required. The second reason is that this sacrament confers a plenitude of grace, so as to take away not only sin but also the remnants of sin, and bodily sickness. The third reason is that its effect on the body, viz. bodily health, is not caused by a natural property of the matter. wherefore it has to derive this efficacy from being consecrated.
Reply to Objection 1: The first consecration sanctifies the matter in itself, but the second regards rather the use of the matter considered as actually producing its effect. Hence neither is superfluous, because instruments also receive their efficacy from the craftsman, both when they are made, and when they are used for action.
Reply to Objection 2: The efficacy which the sacrament derives from its institution, is applied to this particular matter when it is consecrated.
The Reply to the Third Objection is gathered from what has been said.
Whether the matter of this sacrament need be consecrated by a bishop?
Objection 1: It would seem that the matter of this sacrament need not be consecrated by a bishop. Because the consecration of the Eucharistic elements surpasses that of the matter in this sacrament. But a priest can consecrate the matter in the Eucharist. Therefore he can do so in this sacrament also.
Objection 2: Further, in material works the higher art never prepares the matter for the lower, because the art which applies the matter is more excellent than that which prepares it, as stated in Phys. ii, text. 25. Now a bishop is above a priest. Therefore he does not prepare the matter of a sacrament which is applied by a priest. But a priest dispenses this sacrament, as we shall state further on (Q[31]). Therefore the consecration of the matter does not belong to a bishop.
On the contrary, In other anointings also the matter is consecrated by a bishop. Therefore the same applies to this.
I answer that, The minister of a sacrament produces the effect, not by his own power, as though he were the principal agent, but by the efficacy of the sacrament which he dispenses. This efficacy comes, in the first place, from Christ, and from Him flows down to others in due order, viz. to the people through the medium of the ministers who dispense the sacraments, and to the lower ministers through the medium of the higher ministers who sanctify the matter. Wherefore, in all the sacraments which require a sanctified matter, the first consecration of the matter is performed by a bishop, and the application thereof sometimes by a priest, in order to show that the priest's power is derived from the bishop's, according to Ps. 132:2 : "Like the precious ointment on the head," i.e. Christ, "that ran down upon the beard of Aaron" first, and then "to the skirt of his garment."
Reply to Objection 1: The sacrament of the Eucharist consists in the consecration of the matter and not in its use. Consequently, strictly speaking, that which is the matter of the sacrament is not a consecrated thing. Hence no consecration of the matter by a bishop is required beforehand: but the altar and such like things, even the priest himself, need to be consecrated, all of which can be done by none but a bishop: so that in this sacrament also, the priest's power is shown to be derived from the bishop's, as Dionysius observes (Eccl. Hier. iii). The reason why a priest can perform that consecration of matter which is a sacrament by itself, and not that which, as a sacramental, is directed to a sacrament consisting in something used by the faithful, is that in respect of Christ's true body no order is above the priesthood, whereas, in respect of Christ's mystic body the episcopate is above the priesthood, as we shall state further on (Q[40], A[4]).
Reply to Objection 2: The sacramental matter is not one that is made into something else by him that uses it, as occurs in the mechanical arts: it is one, in virtue of which something is done, so that it partakes somewhat of the nature of an efficient cause, in so far as it is the instrument of a Divine operation. Hence the matter needs to acquire this virtue from a higher art or power, since among efficient causes, the more prior the cause the more perfect it is, whereas in material causes, the more prior the matter, the more imperfect it is.
Whether this sacrament has a form?
Objection 1: It would seem that this sacrament has no form. Because, since the efficacy of the sacraments is derived from their institution, as also from their form, the latter must needs be appointed by the institutor of the sacrament. But there is no account of the form of this sacrament being instituted either by Christ or by the apostles. Therefore this sacrament has no form.
Objection 2: Further, whatever is essential to a sacrament is observed everywhere in the same way. Now nothing is so essential to a sacrament that has a form, as that very form. Therefore, as in this sacrament there is no form commonly used by all, since various words are in use, it seems that this sacrament has no form.
Objection 3: Further, in Baptism no form is needed except for the sanctification of the matter, because the water is "sanctified by the word of life so as to wash sin away," as Hugh states (De Sacram. ii). Now the matter of this sacrament is already consecrated. Therefore it needs no form of words.