AND IN JESUS CHRIST, HIS ONLY SON, OUR LORD
What we taught earlier, namely, that Christ is the very object of our faith, stands out clearly in these words which present in Him every aspect of our salvation.
We call Him Jesus, using the title with which heavenly revelation honored Him, for He was sent to save His people from their sins. For this reason the Scripture declares that “there is no other name under heaven given among men by which we must be saved” (Acts 4:12)
The title of Christ signifies that He has fully received the anointing of all the graces of the Holy Spirit (who is symbolized by oil in the Scripture). Without these graces we fall as dry and barren branches. This unction has established Him:
Firstly, as King. The Father has constituted Him King in order that He might subject to Himself all power in heaven and on earth, so that we ourselves may become kings in Him, having dominion over the devil, sin, death and hell.
Secondly, as Priest. This is so that He might give us peace and reconcile us with the Father by His sacrifice, in order that we ourselves might be priests in Him, offering to the Father our prayers, our thanksgivings, ourselves and all that we have, seeing that He is our intercessor and mediator.
In addition, He is called the Son of God, but not as believers are, who are sons through adoption and only by grace. He is the true and legitimate Son, and consequently the only one, unique, in distinction from all others.
He is our Lord, not only because of His deity which, from all eternity, is one with that of the Father, but also in that created flesh in which He has been revealed to us.
For, as St. Paul says, “There is but one God, the Father, from whom come all things and for whom we exist, and but one Lord, Jesus Christ, through whom are all things and by whom we exist” (1 Corinthians 8:6)
John Calvin, Truth For All Time, pp.37, 38