That Jesus Christ, at the Same Time God and Man, is the True and Most Efficacious Mediator
68 But the true Mediator, whom in Your secret mercy You have pointed out to the humble, and sent, that by His example also they might learn the same humility— that “Mediator between God and men, the man Christ Jesus,” appeared between mortal sinners and the immortal Just One— mortal with men, just with God; that because the reward of righteousness is life and peace, He might, by righteousness conjoined with God, cancel the death of justified sinners, which He willed to have in common with them. Hence He was pointed out to holy men of old; to the intent that they, through faith in His Passion to come, even as we through faith in that which is past, might be saved. For as man He was Mediator; but as the Word He was not between, because equal to God, and God with God, and together with the Holy Spirit one God.
69. How have You loved us, O good Father, who spared not Your only Son, but delivered Him up for us wicked ones! How have You loved us, for whom He, who thought it no robbery to be equal with You, “became obedient unto death, even the death of the cross;” He alone “free among the dead,” that had power to lay down His life, and power to take it again; for us was He unto You both Victor and Victim, and the Victor as being the Victim; for us was He unto You both Priest and Sacrifice, and Priest as being the Sacrifice; of slaves making us Your sons, by being born of You, and serving us. Rightly, then, is my hope strongly fixed on Him, that You will heal all my diseases by Him who sits at Your right hand and makes intercession for us; else should I utterly despair. For numerous and great are my infirmities, yea, numerous and great are they; but Your medicine is greater. We might think that Your Word was removed from union with man, and despair of ourselves had He not been “made flesh and dwelt among us.”
70. Terrified by my sins and the load of my misery, I had resolved in my heart, and meditated flight into the wilderness; but You forbade me, and strengthened me, saying, therefore, Christ “died for all, that they which live should not henceforth live unto themselves, but unto Him which died for them.” Behold, O Lord, I cast my care upon You, that I may live, and “behold wondrous things out of Your law.” You know my unskilfulness and my infirmities; teach me, and heal me. Your only Son— He “in whom are hid all the treasures of wisdom and knowledge” — has redeemed me with His blood. Let not the proud speak evil of me, because I consider my ransom, and eat and drink, and distribute; and poor, desire to be satisfied from Him, together with those who eat and are satisfied, and they praise the Lord that seek him.
Source: Confessions (New Advent)