Beginning in 1519 and continuing until the end of his life, Luther expounded a theme that the Sacrament brings and means a fellowship of love and mercy: "This fellowship consists in this, that all the spiritual possessions of Christ and his saints are shared with and become the common property of him who receives this sacrament. Again all sufferings and sins also become common property; and thus love engenders love in return and [mutual love] unites . . . It is like a city where every citizen shares with all the others the city's name, honor, freedom, trade, customs, usages, help, support, protection, and the like, while at the same time he shares all the dangers of fire and flood, enemies and death, losses taxes and the like. For he who would share in the profits must also share in the costs, and ever recompense love with love . . ." For Luther, unity with respect to the Sacrament meant both doctrinal agreement and love. When the prerequisite to church fellowship is defined merely (however important!) in terms of doctrinal fellowship, it can end in a Platonic pursuit of a frigid and rigid mental ideal. Doctrinal unity, true unity in Christ's body and blood, is also a unity of deep love and mercy. If I will not lay down my burden on Christ and the community, or take up the burdens of others who come to the Table, then I should not go to the Sacrament. Close(d) Communion is also a fellowship of love and mercy with my brother and sister in Christ as Luther taught in the previous citation.
Matthew C. Harrison, Christ Have Mercy: How to Put Your Faith in Action
christian-love, communion, lord-s-supper, mercy, sacrament