Annotatio I §.IV: Captivitate Babylonica + Paul — panis is participation; not in pane est
In On the Babylonian Captivity Luther believes not only that Christ’s body is in the bread, but that the bread is Christ’s body — the Words keep him: This = this bread He took and broke.
Paul likewise: the bread we break is participation of Christ’s body — he does not say (NB.) it is in the bread, but the bread itself is that participation; common speech proves the demonstrative subject is bread when He says this is my body.
Latin
Tum in Libro de captivitate Babylonica, Credo inquit, firmiter non modo corpus Christi esse in pane, sed panem esse corpus Christi. Sic enim me servabunt Verba, ubi dicit: accepit panem, gratias agens fregit & dixit: accipite, manducate. Hoc, i. e. hic panis, quem acceperat & fregerat, est corpus meum. Et Paulus, nonne panis quem frangimus participatio corporis Christi est? non dicit (NB.) in pane est; sed ipse panis est participatio corporis Christi, & paulò post ipse usus loquendi & sensus communis probat subjectum sic monstrativum panis (NB.) dum dicit, hoc est corpus meum.