16 Moreover, we ask that the will of God may be done both in heaven and in earth, each of which things pertains to the fulfilment of our safety and salvation. For since we possess the body from the earth and the spirit from heaven, we ourselves are earth and heaven; and in both— that is, both in body and spirit— we pray that God's will may be done. For between the flesh and spirit there is a struggle; and there is a daily strife as they disagree one with the other, so that we cannot do those very things that we would, in that the spirit seeks heavenly and divine things, while the flesh lusts after earthly and temporal things; and therefore we ask that, by the help and assistance of God, agreement may be made between these two natures, so that while the will of God is done both in the spirit and in the flesh, the soul which is new-born by Him may be preserved.
This is what the Apostle Paul openly and manifestly declares by his words: “The flesh,” says he, “lusts against the spirit, and the spirit against the flesh: for these are contrary the one to the other; so that you cannot do the things that you would. Now the works of the flesh are manifest, which are these; adulteries, fornications, uncleanness, lasciviousness, idolatry, witchcraft, murders, hatred, variance, emulations, wraths, strife, seditions, dissensions, heresies, envyings, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in times past, that they which do such things shall not inherit the kingdom of God.
But the fruit of the spirit is love, joy, peace, magnanimity, goodness, faith, gentleness, continence, chastity.” And therefore we make it our prayer in daily, yea, in continual supplications, that the will of God concerning us should be done both in heaven and in earth; because this is the will of God, that earthly things should give place to heavenly, and that spiritual and divine things should prevail.
Source: The Treatises of Cyprian (New Advent)