The whole power of the mass consists in the words of Christ, in which he testifies that forgiveness of sins is bestowed on all those who believe that his body is given and his blood poured out for them. This is why nothing is more important for those who go to hear mass than to ponder these words diligently and in full faith.

 Martin Luther, Luther’s Works, Vol. 36: Word and Sacrament II, ed. Jaroslav Jan Pelikan, Hilton C. Oswald, and Helmut T. Lehmann, vol. 36 (Philadelphia: Fortress Press, 1999), 43.