1 Corinthians 11:27 - Matthew Poole's English Annotations on the Holy Bible

Divines agree, that the unworthiness here spoken of, respecteth not the person of the receiver so much as the manner of the receiving; in which sense, a person that is worthy may receive this ordinance unworthily: it is variously expounded, without due religion and reverence, without faith and love, without proposing a right end in the action, under the guilt of any known sin not repented of, &c. Shall be guilty of the body and blood of the Lord; shall incur the guilt of the profanation of this sacred institution; for an abuse offered to a sign, reacheth to that of which it is a sign; as the abuse of a king's seal, or picture, is justly accounted an abuse of the king himself, whose seal and picture it is. Some carry it higher; he shall be punished, as if he had crucified Christ, the profanation of Christ's ordinance reflecting upon Christ himself.