There are those who are astonished at grace and those who are not.
Both would agree that we have continuing struggles with sin.
Both would agree that Jesus has died for our sins.
But the non-astonished seem to think that the important end-game, the goal of being Christian, is to be more successful at keeping the law. If there is grace, it is to produce this success under the law. And the presence and gift of the Holy Spirit is a means to this end. In the end, it's a new way to win at the old game.
On the other hand, astonishment dawns on us when we realize that the blood of Jesus has won the old game completely. Instead of saying that the blood of Christ is the beginning of our entry into righteous living, we say that we have been declared completely and eternally righteous.
Link: Our being in Christ is the goal of the law
(Our being under the law is not the goal of Christ.)