It is the true body and blood of our Lord Jesus Christ under the bread and wine, for us Christians to eat and to drink, instituted by Christ Himself.
 

The holy Evangelists Matthew, Mark, Luke and St. Paul [the Apostle] write:

Our Lord Jesus Christ, the same night in which He was betrayed, took bread; and when He had given thanks, He broke it and gave it to His disciples, saying Take, eat; this is My body, which is given for you. This do in remembrance of Me.

After the same manner also He took the cup when He had supped, and when He had given thanks, He gave it to them, saying, Drink ye all of it; this cup is the new testament in My blood, which is shed for you for the remission of sins. This do, as oft as you drink it, in remembrance of Me.
 

That is shown us by these words, "Given and shed for you for the remission of sins"; namely, that in the Sacrament forgiveness of sins, life, and salvation are given us through theses words. For where there is forgiveness of sins, there is also life and salvation.
 

It is not the eating and drinking indeed that does them, but the words here written, "Given and shed for you for the remission of sins"; which words, besides the bodily eating and drinking, are the chief thing in the Sacrament; and he that believes these words has what they say and express, namely, the forgiveness of sins.
 

Fasting and bodily preparation are indeed a fine outward training; but he is truly worthy and well prepared who has faith in these words, "Given and shed for you for the remission of sins."

But he that does not believe these words, or doubts, is unworthy and unprepared; for the words "for you" require all hearts to believe.