The Great Commentary of Cornelius à Lapide
John 13:7
Jesus answered and said to him, What I do thou knowest not now, but hereafter thou shalt know. Christ means that in this washing of feet, mysteries are hidden which as yet Peter knew not. "Peter," says S. Ambrose (in his work, De iis qui initiantur, ch. 6), "saw not the hidden meaning, and therefore rejected the service, thinking that the humility of the servant would be compromised should he suffer his Lord to do him this office." " Hereafter thou shalt know," that is, first, "when I shall tell you (ver. 14) that I do this to give to thee, to the apostles, and to the rest of the faithful an example of the greatest humility and most sublime charity;" so S. Cyril interprets. Secondly, because by this ablution penance is signified, and this sacrament must precede that of the Eucharist, as thou, 0 Peter, shalt understand after the Holy Spirit has been sent, for "He shall teach you all things." So S. Cyprian, (Tract. de Cœnâ Dom.), S. Pacianus (Ephesians 1, contra Novat.), S. Gregory (bk. ix. Ep. 39), and SS. Augustine and Bernard imply the same. It was as a type of this that the Jewish priests used, when entering the temple to sacrifice, to wash their hands and feet in the brazen layer that was set for this purpose in front of the Holy of Holies; and this they did for the sake of bodily cleanliness, that by it they might be admonished of spiritual purity.
On this point S. Ambrose is singular in his view; for in his work "On the Sacraments" (bk. iii. ch. 1, and in De iis qui initiantur, ch. 6) he holds that this bodily washing of feet is necessary for all the faithful before baptism, that by it they may be prepared for the Holy Eucharist just as Christ prepared the apostles. Hence he maintains that the washing of feet is a kind of sacrament or sacred rite here sanctioned by Christ, by which we are to be strengthened against the devil's endeavours to trip us up. And for this reason he reckons the washing of feet amongst the rites or ceremonies of baptism, so that it came into use as such at Milan. S. Bernard, too, in his sermon "On the Lord's Supper," calls the washing of feet a sacrament, and implies that it has power for the remission of venial sins; "for," he says, "that we may not be in doubt about the remission of our daily sins, we have the sacrament of it the washing of feet." By " sacrament," however, S. Bernard here understands symbol or figure, as he himself explains a little farther on.
Symbolically, Origen and S. Jerome (in his epistle to Damasus on the first vision of Isaiah) think that Christ washed His apostles' feet to prepare them for the preaching of the gospel, according to the words, "How beautiful are the feet of them that preach the gospel of peace, of them that bring good tidings1" (Isaiah 3:7) Secondly, S. Ambrose thinks that Christ in baptism washes away actual sin by washing the head, but that here, in washing their feet, He washed away the remains of original sin, the movements of concupiscence, for that by this washing He strengthened their feet that is, their affections to make generous resistance to their lower appetites.
Thirdly, S. Augustine and S. Bernard (l.c.) say that by the feet with which we tread the earth are signified the loves, the stains, and the defects which, while we are amid the things of earth, adhere to our affections, as dust or mud to our feet.
S. Ambrose (De Initiandis, ch. 6) gives the mystical reason for the washing of feet as follows: "Peter was clean, but He must wash his foot, for he had by inheritance the sin of the first man when the serpent tripped him up and led him astray; and therefore is his foot washed, that these hereditary sins may he taken away." He alludes here to the word spoken by God to the serpent, "Thou shalt ensnare his heel"
(Gen 3:15). The same Saint says again (De Sacram, book iii. ch. 1), "Because Adam was tripped up by the devil and the venom was poured out over thy feet, therefore dost thou wash thy feet that in that part where the serpent ensnared thee there may be added the more abundant aid of sanctification, so that he be not able to trip thee up hereafter," κ.τ.λ.
Another more literal reason was that those who were to be baptized used to go barefooted as a sign of humility. This going barefooted is called by S. Augustine ("On the Creed," bk. 2 Chronicles 1) "the humility of the feet." And so they used to wash off the stains contracted by their bare feet. This custom spread from the Church of Milan to other churches (see S. Augustine, Epp. 118, 119). Palladius, too, in his Lauriaca, ch. 73, tells how Serapion the Sindonite converted two comic actors, washed their feet and then baptized them; but afterwards, as a great many persons came to think that this washing of feet was sufficient without baptism, it was forbidden by the Council of Eliberis, ch. 48. The Church of Milan, however, continued the usage. Guisseppe Visconti treats at length of this subject in his De Ritibus Baptism (bk. iii. ch. 17, et seq.). Ver. 8. " Peter says to Him, Thou shalt never wash my feet." Origin accuses Peter of headstrong audacity and disobedience, but S. Augustine (Tract. 56) rightly excuses him, inasmuch as this speech of his showed profound faith, reverence, fear, humility, and love. "I," (the words are St. Cyprian's in his treatise on the washing of the feet), "I am ready to die with Thee, if needs be, for this I ought to do, this fate I embrace. For Thee I will gladly present my neck to the executioner; but my God and my Lord prostrate at my feet, this I suffer not, this I dare not endure."
Jesus answered him, If I wash thee not, thou hast no part with Me. First, S. Augustine takes this mystically. Unless I wash away thy venial sins by penance I will not give thee the Eucharist, which I am about to institute, neither shalt thou enter heaven, for nothing that is defiled can enter there. So, too, St. Cyprian in his treatise on the washing of feet. Secondly, according to SS. Chrysostom and Cyril: Unless thou receive the lesson of humility which I give thee in this washing of feet, thou shalt have no part with Me, for only the humble attain to the grace and glory of God.
Thirdly, according to the letter: If thou, 0 Peter, persistest in thy disobedience, thou shalt not communicate with Me in the Eucharistic table, I will give thee no part of the bread that is about to be consecrated into My body, I will not have thee for My familiar friend and the companion of My sacred table. Christ threatens Peter with the loss of His intimate friendship and of the Eucharist, not the loss of His grace and glory; for though Peter was loth to obey, yet this arose from his profound humility and reverence, and was, therefore, worthy of pardon. Toletus says: He threatened not to give Peter the Eucharist by which Christ was to abide in him and he in Christ; for it was chiefly for this that He washed their feet, so that they might be clean and fitly prepared to receive Him when He should give Himself to them and be really united to them. Peter did not distinctly understand what Christ said at the time, but only understood that he was to be cut off from Christ and have nothing in common with Him unless he underwent this washing; afterwards, however, he comprehended the mystery. There is a similar expression in 1 Kings 12:16, where the people, exasperated by the cruelty of Roboam, say, "What part have we in David? or what inheritance in the son of Jesse?"
S. Basil, in his "Discourse on Sin," says, "For this reason threats of this kind were held out by Christ against Peter, that unless he had rectified his will by promptitude and quickening of obedience, not those wonderful blessings which had come to him from God, not his gifts, not the promises made to him, not even that declaration of such and so great a yearning towards the Only-Begotten Son of God the Father, would have served him to expiate his actual disobedience." Hence S. Basil draws from this two remarkable rules of conduct: "He that opposes himself to the commands of God, even though he do so with a pious and friendly intention, such an one is nevertheless for this cause estranged from the Lord." And the second is: "Whatever is said by the Lord, that ought we to receive with all the fulness of our heart." (Reg. xii. ch. 2.)
Simon Peter says to Him, Lord, not only my feet, but also my hands and my head. Struck by the threat of Christ as by a thunderbolt, Peter obeys, and offers more than Christ had asked. Hence S. Basil in his Shorter Rules, 60th Answer, gives a useful rule: "Whatever we have before resolved upon beside that which is commanded by the Lord must be rescinded. This is plainly shown in the case of the Apostle Peter, who had first resolved 'Thou shalt never wash my feet,' but when he heard the Lord say positively, "Unless I wash thee, thou shalt have no part with Me,' straightway changed his mind and said, 'Lord, not only my feet, but also my hands.'"
Again, in the 233rd Answer, St. Basil teaches us from this text that obedience is to be preferred to all the other virtues. "Peter," he says, "although the Lord had borne him witness of such and so great meritorious acts, and had called him and pronounced him blessed in so singular a manner, yet, having in one point only seemed to turn aside from obedience, and that too not from negligence or pride, but from reverence and respect to his Lord, for this and this only is it said to him, 'Unless I wash thy feet, thou shalt have no part with Me.'"