Jamieson, Fausset, and Brown
Repent—The word denotes change of mind, and here includes the reception of the Gospel as the proper issue of that revolution of mind which they were then undergoing.
baptized . . . for the remission of sins—as the visible seal of that remission.
pricked in their hearts—the begun fulfilment of Zechariah 12:10, whose full accomplishment is reserved for the day when "all Israel shall be saved" (see on Romans 11:26).
what shall we do?—This is that beautiful spirit of genuine compunction and childlike docility, which, discovering its whole past career to have been one frightful mistake, seeks only to be set right for the future, be the change involved and the sacrifices required what they may. So Saul of Tarsus (Acts 9:6).
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