In the twelfth century, another notion, a little modified from the former, prevailed on this subject; which was, that consecration by a Priest had the power of abolishing the substance of the bread, and of substituting the very body of Jesus Christ.
This was called the doctrine of Transubstantiation.
This doctrine appeared to Luther, at the dawn of the reformation, to be absurd; and he was of opinion that the sacrament consisted of the substance of Christ's body and blood, together with the substance of the bread and wine; or, in other words, that the substance of the bread remained, but the body of Christ was inherent in it, so that both the substance of the bread and of the body and blood of Christ was there also. This was called the doctrine of Consubstantiation, in contradiction to the former.
Calvin again considered the latter opinion erroneous: he gave it out that the bread was not actually the body of Jesus Christ, nor the wine his blood; but that both his body and blood were sacramentally received by the faithful, in the use of the bread and wine. Calvin, however, confessed himself unable to explain even this his own doctrine. For he says, "if it be asked me how it is, that is, how believers sacramentally receive Christ's body and blood? I shall not be ashamed to confess, that it is a secret too high for me to comprehend in my spirit, or explain in words."
But independently of the difficulties which have arisen from these different notions concerning the nature and constitution of the Lord's supper, others have arisen concerning the time and the manner of the celebration of it.
The Christian churches of the east, in the early times, justifying themselves by tradition and the custom of the passover, maintained that the fourteenth day of the month Nissan ought to be observed as the day of the celebration of this feast, because the Jews were commanded to kill the Paschal Lamb on that day. The western, on the other hand, maintained the authority of tradition and the primitive practice, that it ought to be kept on no other day than that of the resurrection of Jesus Christ. Disputes again of a different complexion agitated the Christian world upon the same subject. One church contended that the leavened, another that unleavened bread only should be used upon this occasion: others contended, whether the administration of this sacrament should be by the hands of the clergy only: others, whether it should not be confined to the sick: others, whether it should be given to the young and mature promiscuously: others, whether it should be received by the communicant standing, sitting, or kneeling, or as the Apostles received it: and others, whether it should be administered in the night time as by our Saviour, or whether in the day, or whether only once, as at the passover, or whether oftener in the year.
Another difficulty, but of a different nature, has occurred with respect to the Lord's supper. This has arisen from the circumstance, that other ceremonies were enjoined by our Saviour in terms equally positive as this, but which most Christians, notwithstanding, have thought themselves at liberty to reject. Among these the washing of feet is particularly to be noticed. This custom was of an emblematic nature. It was enjoined at the same time as that of the Lord's supper, and on the same occasion. But it was enjoined in a more forcible and striking manner. The Sandimanians, when they rose into a society, considered the injunction for this ordinance to be so obligatory, that they dared not dispense with it; and therefore, when they determined to celebrate the supper, they determined that the washing of feet should be an ordinance of their church. Most other Christians, however, have dismissed the washing of feet from their religious observance. The reason given has principally been, that it was an eastern custom, and therefore local. To this the answer has been, that the passover, from whence the Lord's supper is taken, was an eastern custom also, but that it was much more local. Travellers of different nations had their feet washed for them in the east. But none but those of the circumcision were admitted to the passover-supper. If, therefore, the injunction relative to the washing of feet, be equally strong with that relative to the celebration of the supper, it has been presumed, that both ought to have been retained; and, if one has been dispensed with on account of its locality, that both ought to have been discarded.
That the washing of feet was enjoined much more emphatically than the supper, we may collect from Barclay, whose observations upon it I shall transcribe on this occasion.
"But to give a farther evidence, says he, how these consequences have not any bottom from the practice of that ceremony, nor from the words following, 'Do this in remembrance of me,' let us consider another of the like nature, as it is at length expressed by John. [143] 'Jesus riseth from supper and laid aside his garments, and took a towel, and girded himself: after that, he poureth water into a bason, and began to wash the disciples' feet, and to wipe them with the towel wherewith he was girded. Peter said unto him, Thou shalt never wash my feet. Jesus answered him. If I wash thee not, thou hast no part with me. So after he had washed their feet, he said, Know ye what I have done to you? If I then, your Lord and master, have washed your feet, ye also ought to wash one another's feet: for I have given you an example, that ye should do as I have done to you.' As to which let it be observed, continues Barclay, that John relates this passage to have been done at the same time with the other of breaking bread; both being done the night of the passover, after supper. If we regard the narration of this, and the circumstances attending it, it was done with far more solemnity, and prescribed far more punctually and particularly, than the former. It is said only, 'as he was eating he took bread;' so that this would seem to be but an occasional business: but here 'he rose up, he laid by his garments, he girded himself, he poured out the water, he washed their feet, he wiped them with a towel.' He did this to all of them; which are circumstances surely far more observable than those noted in the other. The former was a practice common among the Jews, used by all masters of families, upon that occasion; but this, as to the manner, and person acting it, to wit, for the master to rise up, and wash the feet of his servants and disciples, was more singular and observable. In the breaking of bread and giving of wine, it is not pleaded by our adversaries, nor yet mentioned in the text, that he particularly put them into the hands of all; but breaking it, and blessing it, gave it the nearest, and so they from hand to hand. But here it is mentioned, that he washed not the feet of one or two, but of many. He saith not in the former, that if they do not eat of that bread, and drink of that wine, that they shall be prejudiced by it; but here he says expressly to Peter, that 'if he wash him not, he hath no part with him;' which being spoken upon Peter's refusing to let him wash his feet, would seem to import no less, than not the continuance only, but even the necessity of this ceremony. In the former, he saith as it were passingly, 'Do this in remembrance of me:' but here he sitteth down again; he desires them to consider what he hath done; tells them positively 'that as he hath done to them, so ought they to do to one another:' and yet again he redoubles that precept, by telling them, 'that he has given them an example, that they should do so likewise.' If we respect the nature of the thing, it hath as much in it as either baptism or the breaking of the bread; seeing it is an outward element of a cleansing nature, applied to the outward man, by the command and the example of Christ, to signify an inward purifying. I would willingly propose this seriously to men, that will be pleased to make use of that reason and understanding that God hath given them, and not be imposed upon, nor abused by the custom or tradition of others, whether this ceremony, if we respect either the time that it was appointed in, or the circumstances wherewith it was performed, or the command enjoining the use of it, hath not as much to recommend it for a standing ordinance of the Gospel, as either water-baptism, or bread and wine, or any other of that kind? I wonder then, what reason the Papists can give, why they have not numbered it among their sacraments, except merely Voluntas Ecclesiae et Traditio Patrum, that is, the Tradition of the Fathers, and the Will of the Church."
[Footnote 143: John 13. 3. &c.]