Yesterday's Book of Concord reading made this important point in AC XX:
"People are also warned that the term faith does not mean simply a knowledge of a history, such as the ungodly and devil have (James 2:19). Rather, it means a faith that believes, not merely the history, but also the effect of the history. In other words, it believes this article: the forgiveness of sins."
That observation of the three holiest days of that history begins today. God grant us all to receive their effect!