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Pilgrim said:
The Lord's Table is first and foremost a believer's having communion with CHRIST and not some alleged "communion" with other men who are able to correctly answer a list of arbitrary questions.

The holy Supper is not only a communion with the very body and blood of Christ, it is a communion with every other communicant at the table(1 Cor. 10:17). When churches practice open communion according to some vague formula of profession that permits known errorists and manifest sinners to be communed without examination, it causes great offense among believing Christians. Open communion does not produce unity but rather division.