3 Let us therefore, brethren beloved, pray as God our Teacher has taught us. It is a loving and friendly prayer to beseech God with His own word, to come up to His ears in the prayer of Christ. Let the Father acknowledge the words of His Son when we make our prayer, and let Him also who dwells within in our breast Himself dwell in our voice. And since we have Him as an Advocate with the Father for our sins, let us, when as sinners we petition on behalf of our sins, put forward the words of our Advocate. For since He says, that “whatsoever we shall ask of the Father in His name, He will give us,” how much more effectually do we obtain what we ask in Christ's name, if we ask for it in His own prayer!
Source: The Treatises of Cyprian (New Advent)