The sin and disease of division

Division has always been a disease of the church... The Love Feast, which should have been the sign and symbol of perfect unity, has become a thing of divisions and class distinctions. And here there is something which only the newer translations reveal. In the older translations, it is said that to eat and drink at the sacrament without discerning the Lord's body is the way to judgment and not to salvation. But in the best Greek text, the word Lord's is not included. The sin is not to discern the body; that is to say, not to discern that the church is a body, not to be aware of the oneness of the church, not to be aware of the togetherness in which all its members should be joined.

... William Barclay, Ethics in a Permissive Society