II. In the mass it is necessary that we attend with our a hearts
also; and we do attend, when we exercise faith in our hearts.
Here we must repeat the words of Christ, when He institutes the
mass and says, "Take and eat, this is My Body, which is given for
you"; in like manner over the cup, "Take and drink ye all of it:
this is a new, everlasting Testament in My Blood, which is shed
for you and for many for the remission of sins. This shall ye do,
as oft as ye do it, in remembrance of Me." In these words Christ
has made for Himself a memorial or anniversary, to be daily
observed in all Christendom, and has added to it a glorious,
rich, great testament, in which no interest, money or temporal
possessions are bequeathed and distributed, but the forgiveness
of all sins, grace and mercy unto eternal life, that all who come
to this memorial shall have the same testament; and then He died,
whereby this testament has become permanent and irrevocable. In
proof and evidence of which, instead of letter and seal, He has
left with us His own Body and Blood under the bread and wine.

Here there is need that a man practise the first works of this
Commandment right well, that he doubt not that what Christ has
said is true, and consider the testament sure, so that he make
not Christ a liar. For if you are present at mass and do not
consider nor believe that here Christ through His testament has
bequeathed and given you forgiveness of all your sins, what else
is it, than as if you said: "I do not know or do not believe that
it is true that forgiveness of my sins is here bequeathed and
given me"? Oh, how many masses there are in the world at present!
but how few who hear them with such faith and benefit! Most
grievously is God provoked to anger thereby. For this reason also