John Calvin on the Lord’s Supper

“It is not the principal part of a sacrament simply to hold forth the body of Christ to us without any higher consideration, but rather to seal and confirm that promise by which he testifies that his flesh is meat indeed, and his blood drink indeed, nourishing us unto life eternal, and by which he affirms that he is the bread of life, of which, whosoever shall eat, shall live for ever—I say, to seal and confirm that promise, and in order to do so, it sends us to the cross of Christ, where that promise was performed and fulfilled in all its parts. For we do not eat Christ duly and savingly unless as crucified, while with lively apprehension we perceive the efficacy of his death. When he called himself the bread of life, he did not take that appellation from the sacrament, as some perversely interpret; but such as he was given to us by the Father, such he exhibited himself when becoming partaker of our human mortality, he made us partakers of his divine immortality; when offering himself in sacrifice, he took our curse upon himself, that he might cover us with his blessing, when by his death he devoured and swallowed up death, when in his resurrection he raised our corruptible flesh, which he had put on, to glory and incorruption.”

Taken from 4.17.4