Sunday I preached on Jesus the Son of Adam. I spoke of Adam’s role as federal head for what is typically called ‘the covenant of works’. We see this in Genesis 2 when God issues him the commands and prohibitions. We also see Paul making much of this in Romans 5 since Adam was the type of one to come- another federal head.
I also spent time speaking about Adam (and Eve) as made in God’s image, which was distorted in his disobedience. Jesus in His humanity as Mediator is also the perfect image of God who restores that image in all who are united to Him as head of the New Covenant (we see this in Eph. 4, Col. 3 and Rom. 8).
Once in a while I remember that “you can’t say everything anytime you say anything”, as Richard Pratt taught us. I can’t say I did that on purpose this time, but there was an important thing I meant to say, but didn’t.
When I was a young Christian, some (non-Reformed) theologians tried to tie Jesus’ sufficiency as Savior to His divinity. It was years later, while reading Romans 5 that the quarter dropped for me that this was nonsense.
If Jesus’ death is sufficient for us due to his divinity, then how do we explain that “all sinned” in Adam? He surely isn’t divine.
Additionally, at the risk of sounding Nestorian we know that God cannot die. Because a man (Adam) had sinned, and we sin as humans, a man had to die. Jesus died on the Cross, and He died as a man.
Jesus’ death is sufficient for all who believe for the same reason Adam’s sin brought guilt to all of humanity born of normal conception (which exempts Jesus since Mary was overcome by the Spirit). Adam’s one sin is sufficient to condemn us, and Jesus’ one act of righteousness is enough to save us, because both are federal heads. They have been appointed by God as heads of covenants. This is the biblical and covenantal rationale for the sufficiency of Christ’s atonement for the elect.