Submitting himself to Him, John declares what most reverent humility he must have before Him: "He preached, saying: After me comes One mightier than I, whose sandal strap I am not worthy to stoop down and loose" (Mk 1:7).
Among the ancients there was a custom that if someone did not wish to take as wife the woman betrothed to him, he was obliged to remove the sandal of the one who by right of kinship appeared as bridegroom to her.
What, then, did Christ appear to be among men, if not the Bridegroom of the holy Church? The same John says of this: "He who has the bride is the bridegroom" (Jn 3:29).
But since people thought that John was the Christ, which John himself denies, he rightly says that he is not worthy even to loose the strap of His sandals.
He clearly speaks as if to say: I do not have the power to uncover the feet of our Redeemer, because I do not undeservedly appropriate to myself the name of bridegroom.
Yet this may also be understood otherwise. Who does not know that sandals are made from dead animals? The incarnate Lord appeared as if shod, because in His Godhead He assumed the mortality of our corruption.
For this reason He also says through the Prophet: "Over Edom I will cast My shoe" (Ps 59:10). By Edom is understood paganism, and by the shoe, the mortality He assumed.
Therefore the Lord says that He will cast His shoe over Edom, because when He became known to the Gentiles in the flesh, the Godhead came to us as if in footwear.
But the human eye cannot penetrate the mystery of this Incarnation. For it cannot in any way grasp how the Word is made flesh. Nor can it grasp how the supreme and life-giving Spirit is animated in the Mother's womb.
Nor can it grasp how He who has no beginning both exists and is conceived. Therefore the sandal strap is the bond of the mystery.
John cannot loose the strap of His sandals, because he himself cannot penetrate the mystery of His Incarnation, although he knew of it through the spirit of prophecy.
What, then, do the words mean: "I am not worthy to stoop down and loose the strap of His sandal"? They express a clear and humble consciousness of his own ignorance.
He clearly speaks as if to say: What wonder is it if He is exalted before me, when I behold Him as born after me, yet do not comprehend the mystery of His birth?
Behold John, filled with the spirit of prophecy, renowned for wondrous knowledge. Yet he teaches us about himself that he does not know what cannot be known.
In this matter, most beloved brethren, we must weigh and ponder with full attention how holy men guard the virtue of humility within themselves. When they know something wondrously, they strive to call before the eyes of the mind what they do not know.
They do this so that their soul may not become proud from the side on which it is perfect, while from another side it reflects on its own weakness. For knowledge is a virtue, and humility is the guardian of virtue.
Therefore the mind must be checked, so that the wind of pride may not scatter what the virtue of knowledge gathers.
When you do good, brethren, always call evil deeds back to memory, so that the soul may never heedlessly delight in a good work. It must look cautiously upon its own guilt.
Likewise, regard those above you, especially those who have no fellowship with you, as your neighbors. For you do not know what good is hidden in the very thing which you judge to be some evil in their actions.
Therefore let each strive to be great, yet in some manner let him not know that he truly is so. Otherwise, by boldly claiming greatness for himself, he may lose it.
For this reason it is said through the Prophet: "Woe to those who are wise in their own eyes and prudent in their own sight" (Is 5:21). Therefore Paul says: "Do not be wise in your own opinion" (Rom 12:16).
For the same reason it is said against proud Saul: "Were you not little in your own eyes when you became head?" (1 Sam 15:17). It is clearly said as if thus: When you regarded yourself as small, I magnified you before the others.
But since you regard yourself as great, I count you as small.
By contrast, David, when he danced before the Ark of the Lord's Covenant and looked with contempt upon the might of his kingdom, said: "Before the Lord I will play and dance; and I will be still more contemptible, and will be lowly in my own eyes" (2 Sam 6:21-22).
For who would not be puffed up by breaking the jaws of lions, tearing apart the limbs of bears, being chosen for the kingdom over elder brothers, casting down with one stone the Goliath feared by all. Bringing the appointed number of Philistine foreskins at the king's command, receiving the kingdom according to promises, and afterward possessing the whole people of Israel without any opposition?
Yet in all these things he despised himself, confessing that he was humbled in his own eyes.
Therefore, if holy men think lowly of themselves even when they perform great feats, what will those say in their own defense who are puffed up without performing any feat?
Even if there were some good works, they are nothing if they are done without humility. For a wondrous deed with pride does not exalt, but casts down.
Whoever gathers virtues without humility throws dust into the wind. From the very place where he seems to acquire something, he becomes still more blinded.
Therefore, my brethren, in all your deeds regard humility as the root of the good work. Look not at what you have already risen to, but at what you still fall short of.
Having before your eyes those who are better than you, you will be able always to ascend to higher things through humility.