Note:
Here Luther says that the main benefit to us of Christ’s passion is that we are crushed by the Law. Surprising? It comes down to understanding the fact that if I had not sinned then Christ would not have had to suffer and die. Each of us can truthfully say “I am personally responsible for Jesus’s death.” The grace only benefits me after that.

And, of course, no competent preacher or witness leaves hearers crushed by the Law. We must always, always make sure that the Gospel is then spoken clearly and completely.

Quote:
“We must give ourselves wholly to this matter, for the main benefit of Christ’s passion is that man sees into his own true self and that he be terrified and crushed by this. Unless we seek that knowledge, we do not derive much benefit from Christ’s passion.”  (page 10)

Source: Luther, Martin. “A Meditation on Christ’s Passion” (1519) Luther’s Works Vol. 42. Philadelphia: Fortress Press, 1969.