I tell you that he will avenge them speedily. "Non bientot, mais bien rite" (Godet). It means that God will act in accordance with his servant's prayer, not soon, but suddenly; sure and sudden at the crisis the action of Divine providence comes at the last "as a thief in the night."
Nevertheless when the Son of man cometh, shall he find faith on the earth? These difficult words seem to point at least to a fear lest, the second coming being long delayed, true faith would have died out of the hearts even of the godly.
Such a fear might be Jesus'; for we know, from his own lips, that to him, while on earth and wearing the body of humiliation, the day and hour of the second advent was not known. Was not our Lord speaking with the same sad onlook in his parable of the virgins, when he said, "they all slumbered and slept," wise virgins as well as foolish (Matthew 25:5)?
"It is often the case that God's action as a Deliverer is delayed until his people have ceased to hope for deliverance. So it was with Israel in Egypt; so was it with her again in Babylon. ' Grief was calm and hope was dead' among the exiles when the word came that they were to return to their own land; and then the news seemed too good to be true.
They were 'like them that dream' when they heard the good tidings. This method of Divine action—long delay followed by a sudden crisis—so frankly recognized by Christ, is one to which we find it hard to reconcile ourselves.
These parables help us so far, but they do not settle everything. They contain no philosophy of Divine delay, but simply a proclamation of the fact, and an assurance that, in spite of delay, all will go well at the last with those who trust in God" (Professor Bruce).