[Christ’s] body is given to us under the symbol of bread, and his blood is given to us under the symbol of wine, in order to make us by receiving them one body and blood with him. Having his body and blood in our members, we become bearers of Christ and sharers, as Saint Peter says, in the divine nature. Once, when speaking to the Jews, Christ said: Unless you eat my flesh and drink my blood you shall have no life in you. This horrified them and they left him. Not understanding his words in a spiritual way, they thought the Savior wished them to practice cannibalism. Under the old covenant there was showbread, but it came to an end with the old dispensation to which it belonged. Under the new covenant there is bread from heaven and the cup of salvation. These sanctify both soul and body, the bread being adapted to the sanctification of the body, the Word, to the sanctification of the soul. Do not, then, regard the eucharistic elements as ordinary bread and wine: they are in fact the body and blood of the Lord, as he himself has declared. Whatever your senses may tell you, be strong in faith.