Now when they heard this, they were pricked in their hearts, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?
All Commentaries on Acts 2:37 Go To Acts 2
Augustine of Hippo
AD 430
For on the sending down of the Holy Spirit after the Lord’s passion, and resurrection, and ascension, when miracles were being done in the name of Him whom, as if dead, the persecuting Jews had despised, they were pricked in their hearts; and they who in their rage slew Him were changed and believed; and they who in their rage shed His blood, now in the spirit of faith drank it; they acknowledged their sin, they learned something of the Apostle, that they might not despair of the pardon of the Preacher.