" What did the Messiah need to do in order to be the Lamb of God, in order to make an atonement for the people of Israel? We know that Jesus came to die for our sins, but why did He not simply come down from heaven on Good Friday, go to the cross, arise on Easter, and go back to heaven? It was because Christ’s work on the cross was only half of His mission. In order for Jesus to die for our sins, it was first necessary for Him to fulfill the role that Adam failed to fulfill. He had to fulfill all righteousness. "

― R.C. Sproul , How Then Shall We Worship?: Biblical Principles to Guide Us Today