And thus all the sin of this world, from its origin in the world to the end of it in the world, was laid upon Him: both sin as it is in itself and sin as it is when committed by us; sin in its tendency, and sin in the act; sin as it is hereditary in us, uncommitted by us, and sin as it is committed by us.
A correct understanding of the Covenants is vital to a correct understanding of the Gospel of Jesus. The new Covenant is God's one-way-promise to us whereas the Old Covenant is the people's promise to do only what God is capable of doing. This Old Covenant is worthless and leads to only death. Man cannot fulfill God's promise - only God can.
Many rebel against the idea that ALL must be received as a gift; our efforts do not contribute one iota towards our salvation.
It is not enough to confess that Jesus Christ did come in the flesh; that will bring no salvation to anybody. We must confess from positive knowledge that Jesus is just now come in the flesh, and then we are of God. Christ came in the flesh eighteen hundred years ago, just for the purpose of demonstrating the possibility.