We often throw the word “sacrament” around, but what is a sacrament? A sacrament is a sacred rite; a means that communicates something to the partaker. But not only does it communicate something, it also seals something. The Lord’s Supper is a sacrament, because it seals and confirms the grace of the gospel in us.
By eating and drinking we are being reminded of God’s covenant with us. Just as the rainbow reminded God of his covenant with his people, so this table reminds God of his covenant loyalty toward us.
And because of its rich significance, Paul calls the baptized to come in a spirit of thanksgiving. This sacrament is a taste of redemption accomplished and applied, and so it is for you. In this meal you receive God’s grace to live faithfully in this garden, in this land, and in this world.