Whether the consecration of this sacrament belongs to a priest alone?

Objections

Objection 1 : It seems that the consecration of this sacrament does not belong exclusively to a priest. Because it was said above (Question [78], Article [4]) that this sacrament is consecrated in virtue of the words, which are the form of this sacrament. But those words are not changed, whether spoken by a priest or by anyone else. Therefore, it seems that not only a priest, but anyone else, can consecrate this sacrament.
Objection 2 : Further, the priest performs this sacrament in the person of Christ. But a devout layman is united with Christ through charity. Therefore, it seems that even a layman can perform this sacrament. Hence Chrysostom (Opus imperfectum in Matth., Hom. xliii) says that "every holy man is a priest."
Objection 3 : Further, as Baptism is ordained for the salvation of mankind, so also is this sacrament, as is clear from what was said above (Question [74], Article [1]; Question [79], Article [2]). But a layman can also baptize, as was stated above (Question [67], Article [3]). Consequently, the consecration of this sacrament is not proper to a priest.
Objection 4 : Further, this sacrament is completed in the consecration of the matter. But the consecration of other matters such as the chrism, the holy oil, and blessed oil, belongs exclusively to a bishop; yet their consecration does not equal the dignity of the consecration of the Eucharist, in which the entire Christ is contained. Therefore it belongs, not to a priest, but only to a bishop, to perform this sacrament.