Pseudo-Augustine — as excerpted in the Catena Aurea on Luke 11:1-4

“(App. Serm. 84.) The first word, how gracious is it? Thou durst not raise thy face to heaven, and suddenly thou receivest the grace of Christ. From an evil servant thou art made a good son. Boast not then of thy working, but of the grace of Christ; for therein is no arrogance, but faith. To proclaim what thou hast received is not pride, but devotion. Therefore raise thy eyes to thy Father, who begot thee by Baptism, redeemed thee by His Son. Say Father as a son, but claim no especial favour to thyself. Of Christ alone is He the especial Father, of us the common Father. For Christ alone He begot, but us he created. And therefore according to Matthew when it is said, Our Father, (Matt. 6:9.) it is added, which art in heaven, that is, in those heavens of which it was said, The heavens declare the glory of God. (Ps. 19:1.) Heaven is where sin has ceased, and where there is no sting of death.”