8 Next after this we pray, saying, “Lead us not into temptation, but deliver us from evil.” This also, that we be not led into temptation, it is necessary for us to ask in this life, because in this life there are temptations; and that “we may be delivered from evil,” because there is evil here. And thus of all these seven petitions, three have respect to the life eternal, and four to the present life. “Hallowed be Your name.” This will be for ever. “Your kingdom come.” This kingdom will be for ever. “Your will be done as in heaven, so in earth.” This will be for ever. “Give us this day our daily bread.” This will not be for ever. “Forgive us our debts.” This will not be for ever. “Lead us not into temptation.” This will not be for ever. “But deliver us from evil.” This will not be for ever: but where there is temptation, and where there is evil, there is it necessary that we make this petition.
Source: Sermons on Selected Lessons of the New Testament (New Advent)