Catena Aurea on John 5:1–13: Augustine of Hippo

So then Christ came to the Jewish people, and by means of mighty works, and profitable lessons, troubled the sinners, i. e. the water, and the stirring continued till He brought on His own passion. But He troubled the water, unknown to the world. For had they known Him, they would not have crucified the Lord of glory. (1 Cor. 11) But the troubling of the water came on all at once, and it was not seen who troubled it. Again, to go down into the troubled water, is to believe humbly on our Lord’s passion. Only one was healed, to signify the unity of the Church: whoever came afterwards was not healed, to signify that whoever is out of this unity cannot be healed. Wo to them who hate unity, and raise sects. Again, he who was healed had had his infirmity thirty and eight years: this being a number which belongs to sickness, rather than to health. The number forty has a sacred character with us, and is significative of perfection. For the Law was given in Ten Commandments, and was to be preached throughout the whole world, which consists of four parts; and four multiplied into ten, make up the number forty. And the Law too is fulfilled by the Gospel, which is written in four books. So then if the number forty possesses the perfectness of the Law, and nothing fulfils the Law, except the twofold precept of love, why wonder at the impotence of him, who was two less than forty? Some man was necessary for his recovery; but it was a man who was God. He found the man falling short by the number two, and therefore gave two commandments, to fill up the deficiency. For the two precepts of our Lord signify love; the love of God being first in order of command, the love of our neighbour, in order of performance. Take up thy bed, our Lord saith, meaning, When thou wert impotent, thy neighbour carried thee; now thou art made whole, carry thy neighbour. And walk; but whither, except to the Lord thy God.