You are my God; have mercy on me, O Lord,
for to you do I cry all the day. (Psalm 86:2-3)

1. No greater gift could God have given to men than in making His Word, by which He created all things, their Head, and joining them to Him as His members: that the Son of God might become also the Son of man, one God with the Father, one Man with men; so that when we speak to God in prayer for mercy, we do not separate the Son from Him; and when the Body of the Son prays, it separates not its Head from itself: and it is one Saviour of His Body, our Lord Jesus Christ, the Son of God, who both prays for us, and prays in us, and is prayed to by us.

St. Augustine of Hippo, “Expositions on the Book of Psalms,” in Saint Augustin: Expositions on the Book of Psalms, ed. Philip Schaff, trans. A. Cleveland Coxe, vol. 8, A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, First Series (New York: Christian Literature Company, 1888), pages 409–410.

My Notes: Our prayer to the Father for mercy is the one same prayer of Jesus to the Father for the same mercy. Jesus prays with us, we have the same prayer: mercy.