The Lord's Supper - Expression of the Unity of the Body
Extracted from "On Worship" - Collected Wrtitings, Vol. 2
"Because we, being many, are one loaf, one body; for we all partake of that one loaf" (1. Cor. 10:17).
We have seen that the Holy Spirit being the source, the power, and inspirer of all true Christian worship, the unity of the body formed by Him, and in which He acts, necessarily holds a prominent place in the worship which He produces in its members so united. Love, which is the soul of it, is defective in one of its most perfect forms, if conscience as to this unity is wanting.
The presence of the Holy Spirit produces the consciousness of this unity, of which He is the author and the bond. Now, considered in one aspect, the Lord's supper is the expression of this unity. We are all but "one body; for we are all partakers of that one bread" (or, as in the original, "of that one loaf").
If the bread broken represents, on the one hand, the broken body of Christ, the unity of the bread represents, on the other, the unity of His spiritual body.
As the Spirit embraces all saints, so do the hearts of believers. Thus, "When I knew," said the apostle, "your love unto all saints." And again, "That ye may comprehend with all saints what is the breadth, and length, and depth, and height, and to know the love of Christ which passeth knowledge."