19 Now these three first petitions, “Hallowed be Your Name, Your kingdom come, Your will be done as in heaven so in earth,” these three regard the life eternal, for God's Name ought to be hallowed in us always, we ought to be in His kingdom always, we ought to do His will always. This will be to all eternity. But “daily bread” is necessary now. All the rest that we pray for from this article, regards the necessities of the present life. Daily bread is necessary in this life; the forgiveness of our debts is necessary in this life.
For when we shall arrive at the other life, there will be an end of all debts. In this life there is temptation, in this life the sailing is dangerous, in this life something is ever stealing its way in through the chinks of our frailties, which must be pumped out. But when we shall be made equal to the Angels of God; no more need to say and pray to God to forgive us our debts, when there will be none. Here then is the “daily bread;” here the prayer that our “debts may be forgiven;” here that we “enter not into temptation;” for in that life temptation does not enter; here that we may be “delivered from evil;” for in that life there will be no evil, but eternal and abiding good.
Source: Sermons on Selected Lessons of the New Testament (New Advent)