Thomas Aquinas, on 1Cor 1:12

“Now this I say, that every one of you saith: I indeed am of Paul; and I am of Apollo; and I am of Cephas; and I of Christ.”

“Then he specifies the nature of the contention when he says: What I mean is, i.e., the contention consists in this, that every one of you gives himself a name derived from the person by whom he was baptized and instructed, and says: I belong to Paul, because he had been baptized and instructed by Paul; another says: I belong to Apollos, who had preached to the Corinthians (Ac 19); still another says: and I belong to Cephas, i.e., Peter, to whom it had been said: "You shall be called Cephas, which is interpreted Peter" (Jn. 1:42). Now they made these statements, because they thought that they received a better baptism from a better baptizer, as though the virtue of the minister had an influence on the one baptized. Finally, others say: I belong to Christ, Who alone gives grace, because the grace of Christ alone works in Christ's baptism: "He upon whom you shall see the Spirit descending and remaining upon him, he it is that baptizes with the Holy Spirit" (Jn. 1:33). Accordingly, the baptized are called Christians from Christ alone and not Paulians from Paul: "Only let us be called by your name" (Is 4:1). In order to avoid this error the Greeks are said to have used the following formula in baptism: "Let Christ's servant, Nicholas, be baptized in the name of the Father and of the Son and of the Holy Spirit," to show that a man is not baptized interiorly, unless he is baptized by Christ. But because a man also baptizes, as a minister and member of Christ, the Church uses this formula in baptizing: "I baptize you in the name of the Father and of the Son and of the Holy Spirit," which is more in keeping with the formula given by Christ, Who said to the disciples: "Teach all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit" (Matt 28:19), where He also calls the apostles baptizers. It is according to this command that the minister says: "I baptize you."”

Imported from an open dataset — not yet checked against the printed edition.