The first is in two parts: in the first, he shows what a sacrament is; in the second, the necessity of the institution of the sacraments, at: The sacraments were instituted for a threefold cause.
Circa primum duo facit: primo ponit sacramentum in genere signi; secundo definit signum, ibi: signum vero est res praeter speciem quam ingerit sensibus, aliquid aliud ex se faciens in cognitionem venire.