Psalms 80:3

"O God, convert us." For averse we have been from You, and unless You convert us, we shall not be converted. "And illumine Your face, and we shall be saved" [Psalm 80:3]. Hath He anywise a darkened face? He has not a darkened face, but He placed before it a cloud of flesh, and as it were a veil of weakness; and when He hung on the tree, He was not thought the Same as He was after to be acknowledged when He was sitting in Heaven. For thus it has come to pass. Christ present on the earth, and doing miracles, Asaph knew not; but when He had died, after that He rose again, and ascended into Heaven, he knew Him. He was pricked to the heart, and he may have spoken also of Him this testimony which now we acknowledge in this Psalm. You covered Your face, and we were sick: illumine Thou the same, and we shall be whole.

For whatever other words we may say, whatever words the fervor of the suppliant utters at the beginning of his petition to define it or follows up afterward to intensify it, we say nothing that is not found in this prayer of the Lord, if we pray properly and fittingly. But whoever says anything in his prayer that does not accord with this Gospel prayer, even if his prayer is not of the forbidden sort, it is carnal, and I am not sure it ought not to be called forbidden, since those who are born again of the Spirit ought to pray only in a spiritual manner. For instance, he who says, "Be sanctified among all people, as you have been sanctified among us," and, "May your prophets be found faithful," what else does he say but "Hallowed be your name"? And he who says, "O God of hosts, convert us and show your face, and we will be saved," what else does he say but "Your kingdom come"? He who says, "Direct my steps according to your word, and let no iniquity have dominion over me," what else does he say but "Your will be done on earth as it is in heaven"? He who says, "Give me neither poverty nor riches," what else does he say but "Give us this day our daily bread"? He who says, "O Lord, remember David and all his meekness," or "Lord, if I have done this thing, if there be iniquity in my hands, if I have rendered to them that have repaid me evils," what else does he say but "Forgive us our debts as we also forgive our debtors"? He who says, "Take from me the greediness of the belly and let not the lusts of the flesh take hold of me," what else does he say but "Lead us not into temptation"? He who says, "Deliver me from my enemies, O God, and defend me from them that rise up against me," what else does he say but "Deliver us from evil"? And if you were to run over all the words of holy prayers, you would find nothing, according to my way of thinking, that is not contained and included in the Lord's Prayer. Hence when we pray, it is allowable to say the same things in different words, but it ought not to be allowable to say different things.