Luke 11:4

This also was necessarily added, for no one is found without sin, that we should not be hindered from the holy participation on account of man's guilt. For whereas we are bound to render unto Christ all manner of holiness, who maketh His Spirit to dwell in us, we are to be blamed if we keep not our temples clean for Him. But this defect is supplied by the goodness of God, remitting to human frailty the severe punishment of sin. And this act is done justly by the just God, when we forgive as it were our debtors, those, namely, who have injured us, and have not restored what was due. Hence it follows, For we also forgive every one that is indebted to us. For it is impossible not to be tempted by the devil, but we make this prayer that we may not be abandoned to our temptations. Now that which happens by Divine permission, God is sometimes in Scripture said to do. And in this way by hindering not the increase of temptation which is above our strength, he leads us into temptation.

(in reg. brev. ad inter. 221.) It does not however become us to seek by our prayers bodily afflictions. For Christ has universally commanded men every where to pray that they enter not into temptation. But when one has already entered, it is fitting to ask from the Lord the power of enduring, that we may have fulfilled in us those words, He that endureth to the end shall be saved. (Mat. 10:22.)

(Orat. Dom. Serm. 5.) Having taught us to take confidence through good works, He next teaches us to implore the remission of our offences, for it follows, And forgive us our sins.

Considering then these things, we ought to show mercy to our debtors. For they are to us if we are wise the cause of our greatest pardon; and though we perform only a few things, we shall find many. For we owe many and great debts to the Lord, of which if the least part should be exacted from us, we should soon perish.

(in Enchirid. c. 116.) But what Matthew has placed at the end, But deliver us from evil, Luke has not mentioned, that we might understand it belongs to the former, which was spoken of temptation. He therefore says, But deliver us, not, "And deliverus," clearly proving this to be but one petition," Do not this, but this." But let every one know that he is therein delivered from evil, when he is not brought into temptation.