They said therefore to him, What sign show you then, that we may see, and believe you? what do you work?…
Christ is such meat and drink as preserves from death. Other meat and drink cannot keep man from the grave. That rich man that fared deliciously every day was not made immortal. "The rich man died and was buried" (Luke 16:22). All that generation that fed on manna, and drank the water out of the rock, died (John 6:49). But Christ preserves the soul from death (John 6:50). This is the bread of God that came down from heaven, that a man may eat thereof and not die. It immortalizes the soul that feeds on it. He that believeth on Him hath eternal life (ver. 51). Other meat and drink cannot preserve a living body from death, much less can it give life, and restore breath to a dead body. Put the most delicate meat, the strongest drink, into the mouth of a dead man, and they will not give him life if the soul be quite departed. They may recover from a swoon, they cannot from death. But the flesh and blood of Christ quicken the dead. Christ, by putting His flesh and blood into the mouth of the dead soul, conveys life into it. His flesh and blood make the lips of the dead to speak. "As the Father raiseth the dead and quickeneth them, so the Son quickeneth whom He will" (John 5:21). If thou hast any spiritual life in thee, thou didst receive it from the enlivening virtue of Christ's flesh and blood communicated to thee by the Spirit of life.
Parallel VersesKJV: They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work?