Sacraments may simply be defined as visible signs and seals of spiritual graces. I hold, with the Reformed tradition, that there are only two sacraments: baptism and the Lord’s Supper, whose Old Testaments counterparts are circumcision and the Lord’s Supper.
Though administered differently, within their respective dispensations, the sacraments are fundamentally pointing in the same direction: Christ and all his benefits. Perhaps a sacramental reading of 1 Corinthians 10:1-4 will make this unmistakably clear.
Having been washed with water, we come to Table, to feed on the One who has made us his own.