Jonathan Edwards, Sermons on the Lord's Supper, p. 77:
The very design of the ordinance is a feast of Christian love and friendship. And what friendship is it? 'Tis not a civil friendship. There are other covenants and other friendships; but 'tis a Christian friendship, a spiritual friendship, a holy Friendship. 'Tis friendship with Christ and one with another. But how can they come and seal such friendship who are no friends? How can they seal peace who have never made their peace?