“But it is the chief subject of all Holy Scripture to know and understand God when He makes a promise. For He helps and brings support even with the actual realization of His promise and when it is fulfilled; but before this He disciplines faith in the promise by means of a lack of the things of which we are in need. He does this in order that we may learn to trust Him and not to tempt Him” (LW 8:201).
Read what Martin Luther says about debating with Satan when alone from volume 54 of Luther's works.
Read what Martin Luther said about the Spiritual Estate in Luther's Works, volume 46.
Read what Martin Luther said about the death of God in Luther's Works, volume 41.
Read what Martin Luther says about how sins are forgiven in Luther's Works, volume 30.
Read what Martin Luther said about true worship in volume 12 of Luther's Works.