John Chrysostom
One must approach Baptism after first renouncing and condemning one's sins.
What does "teaching about baptisms" mean? There are not many baptisms, but one. Why then did he speak in the plural?
Because he had said above, "Let us not again lay the foundation of repentance from dead works."
If they needed him to baptize them again, catechize them again, and from the beginning teach the baptized again what must and must not be done, they would always remain incorrigible.
"Of the laying on of hands." Thus they received the Holy Spirit: "And when Paul laid his hands on them, the Holy Spirit came upon them" (Acts 19:6).
"Of the resurrection of the dead." This takes place in Baptism and is affirmed in the confession of faith.
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"And of eternal judgment." Why does he speak of this? Because they probably either wavered after believing, or lived badly and negligently.
For this reason he said, "Be watchful." Thus he spoke these words to correct them from such negligence and make them more attentive.
One must not say: if we now live negligently, we shall be baptized again, receive catechesis again, and again receive the Spirit.
Nor may one say: if we have now fallen from the faith, through Baptism we shall again be able to wash away sins and receive the same things of which we were counted worthy before.
You are deceived, he says, if you reason in this way.