Christology 101 (Pt. 3): The Role of the Son in the Plan of Redemption
As the Son of God, Jesus plays a unique role in God’s plan of redemption.
This plan is outlined clearly by the Apostle Paul in Ephesians 1:3–14, where God the Father chooses a people to adopt unto sonship, God the Son redeems them with blood, and God the Spirit seals the benefits of redemption to the redeemed, thus marking, authenticating, and securing believers unto eternal glory as forgiven, reconciled, accepted, and beloved children of God.
Concerning the Son’s unique role, the text says,
In love 5 he [the Father] predestined us for adoption to sonship through Jesus Christ, in accordance with his pleasure and will — 6 to the praise of his glorious grace, which he [the Father] has freely given us in the One he loves. 7 In him [the Son] we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God’s grace 8 that he lavished on us.
In the ancient world, the concept of redemption was associated with slavery or imprisonment.
To be set free from either required the payment of a price — a redemption price.
Just like the Israelites were enslaved by the Egyptians and needed someone like Moses to set them free, we are enslaved to our sinful nature (the flesh/sarx/σάρξ) and imprisoned under the just condemnation of God’s law.
The only way for us to be set free is for a qualified substitute to fulfill the demands of justice.