Till seven times? - The Jews caught that a man was to forgive another three times, but not the fourth. Peter more than doubled this, and asked whether forgiveness was to be exercised to so great an extent.
I say not unto thee, Until seven times, but, Until seventy times seven - The meaning is, that we are not to limit our forgiveness to any fixed number of times. See Genesis 4:24. As often as a brother injures us and asks forgiveness, we are to forgive him. It is, indeed, his duty to ask forgiveness, Luke 17:4. If he does this, it is our duty to declare that we forgive him, and to treat him accordingly. If he does not ask us to forgive him, yet we are not at liberty to follow him with revenge and malice, but are still to treat him kindly and to do him good, Luke 10:30-37.

Seventy times seven - There is something very remarkable in these words, especially if collated with Genesis 4:24, where the very same words are used - "If any man kill Lamech, he shall be avenged seventy times seven." The just God punishes sin in an exemplary manner. Sinful man, who is exposed to the stroke of Divine justice, should be abundant in forgiveness, especially as the merciful only shall find mercy. See the note on Matthew 5:7, and on Matthew 6:14, Matthew 6:15 (note). The sum seventy times seven makes four hundred and ninety. Now an offense, properly such, is that which is given wantonly, maliciously, and without Any Provocation. It is my opinion, that, let a man search ever so accurately, he will not find that he has received, during the whole course of his life, four hundred and ninety such offenses. If the man who receives the offense has given any cause for it, in that case, the half of the offense, at least, towards his brother, ceases.

Jesus saith unto him, I say not unto thee,.... Which is as if he had said, observe what I am about to say, I do not agree to what thou sayest to fix the number, "until seven times only", but
until seventy times seven; a certain number for an uncertain, see Genesis 4:24. Christ's meaning is, that a man should be all the days, and every day of his life, forgiving those that sin against him, as often as they repent and acknowledge their fault; and that no time is to be set for the exercise of the grace of forgiveness; but as often as there are objects and occasions, though ever so many and frequent, it should be used; and which he illustrates by the following parable.

Jesus saith unto him, I say not unto thee, Until seven times; but, Until seventy times seven--that is, so long as it shall be needed and sought: you are never to come to the point of refusing forgiveness sincerely asked. (See on Luke 17:3-4).

Until seventy times seven. That is, there should be no limit at which it shall be refused if it is asked in the spirit of sincere penitence. By reference to Luke 17:4, one can see the condition of forgiveness. It is that the offender professes repentance. We are to forgive men their trespasses on the same condition that God forgives us ours, and he does not forgive the impenitent. Our mercy must be just as unlimited as that of God.

Till seventy times seven - That is, as often as there is occasion. A certain number is put for an uncertain.