hee," etc.
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SECOND ARTICLE [III, Q. 66, Art. 2]

Whether Baptism Was Instituted After Christ's Passion?

Objection 1: It seems that Baptism was instituted after Christ's
Passion. For the cause precedes the effect. Now Christ's Passion
operates in the sacraments of the New Law. Therefore Christ's Passion
precedes the institution of the sacraments of the New Law: especially
the sacrament of Baptism since the Apostle says (Rom. 6:3): "All we,
who are baptized in Christ Jesus, are baptized in His death," etc.

Obj. 2: Further, the sacraments of the New Law derive their efficacy
from the mandate of Christ. But Christ gave the disciples the mandate
of Baptism after His Passion and Resurrection, when He said: "Going,
teach ye all nations, baptizing them in the name of the Father," etc.
(Matt. 28:19). Therefore it seems that Baptism was instituted after
Christ's Passion.

Obj. 3: Further, Baptism is a necessary sacrament, as stated above
(Q. 65, A. 4): wherefore, seemingly, it must have been binding on man
as soon as it was instituted. But before Christ's Passion men were
not bound to be baptized: for Circumcision was still in force, which
was supplanted by Baptism. Therefore it seems that Baptism was not
instituted before Christ's Passion.

_On the contrary,_ Augustine says in a sermon on the Epiphany
(Append. Serm., clxxxv): "As soon as Christ was plunged into the
waters, the waters washed away the sins of all." But this was before
Christ's Passion. Therefore Baptism was instituted before Christ's
Passion.

_I answer that,_ As stated above (Q. 62, A. 1), sacraments derive
from their institution the power of conferring grace. Wherefore it
seems that a sacrament is then instituted, when it receives the power
of producing its effect. Now Baptism received this power when Christ
was baptized. Consequently Baptism was truly instituted then, if we
consider it as a sacrament. But the obligation of receiving this
sacrament was proclaimed to mankind after the Passion and
Resurrection. First, because Christ's Passion put an end to the
figurative sacraments, which were supplanted by Baptism and the other
sacraments of the New Law. Secondly, because by Baptism man is "made
conformable" to Christ's Passion and Resurrection, in so far as he
dies to sin and begins to live anew unto righteousness. Consequently
it behooved Christ to suffer and to rise again, before proclaiming to
man his obligation of conformi