And the two disciples heard him speak, and they followed—became followers of—Jesus. This event, if not profoundly symbolic (as Godet says), is typical of the whole process which has gone on in augmenting rapidity from that day to this.
If Jesus were what John said, if they were able on his showing to grasp this much concerning the Lord, they would find in him what John could never be to them. John might awaken the sense of sin, peril, shame, and fear; he had no power to allay it.
The lonely Christ has as yet not called one disciple into his fellowship, but as Lamb of God he has power to draw all men to himself. The word now spoken was enough. It divided the bond which up to this time had united the disciples to John, and made them conspicuous forever in the group which "follow the Lamb whithersoever he goeth."
"Primae origines ecclcsiae Christianae" (Bengel).