“We shall benefit very much from the Lord’s Supper if this thought is impressed and engraved upon our minds: that none of the brethren can be injured, despised, rejected, abused, or in any way offended by us, without at the same time, injuring, despising, and abusing Christ by the wrongs we do; that we cannot disagree with our brethren without at the same time disagreeing with Christ; that we cannot love Christ without loving Him in the brethren; that we ought to take the same care of our brethren’s bodies as we take of our own; for they are member’s of our body; and that, as no part of our body is touched by any feeling of pain which is not spread among all the rest, so we ought not to allow a brother to be affected by any evil, without being touched with compassion for him. Accordingly, Augustine with good reason frequently calls this Sacrament ‘the bond of love.'”
–John Calvin, Institutes of the Christian Religion, John T. McNeill, ed, Ford Lewis Battles, trans, Library of Christian Classics (Philadelphia: Westminster, 1960 [1559]), IV.xvii.38.