Augustine of Hippo
Let every man, therefore, conform himself to the usage prevailing in the Church to which he may come. For none of these methods is contrary to the Christian faith or the interests of morality, as favoured by the adoption of one custom more than the other. If this were the case, that either the faith or sound morality were at stake, it would be necessary either to change what was done amiss, or to appoint the doing of what had been neglected. But mere change of custom, even though it may be of advantage in some respects, unsettles men by reason of the novelty: therefore, if it brings no advantage, it does much harm by unprofitably disturbing the Church.
This is the chief cause of this insane profanity, that the figure resembling the living person, which induces men to worship it, hath more influence in the minds of these miserable persons, than the evident fact that it is not living, so that it ought to be despised by the living.
So if it’s you that are the body of Christ and its members, it’s the mystery meaning you that has been placed on the Lord’s table; what you receive is the mystery that means you. It is to what you are that you reply Amen, and by so replying you express your assent. What you hear, you see, is The body of Christ, and you answer, Amen. So be a member of the body of Christ, in order to make that Amen true.