4 So then the Lord also raised Lazarus to life. You have heard what type of character he represents; in other words, what is meant by the resurrection of Lazarus. Let us now, therefore, read over the passage; and as there is much in this lesson clear already, we shall not go into any detailed exposition, so as to take up more thoroughly the necessary points. “Now a certain man was sick, [named] Lazarus, of Bethany, the town of Mary and Martha, his sisters.” In the previous lesson you remember that the Lord escaped from the hands of those who sought to stone Him, and went away beyond Jordan, where John baptized. When the Lord therefore had taken up His abode there, Lazarus fell sick in Bethany, which was a town lying close to Jerusalem.
5. “But Mary was she who anointed the Lord with ointment, and wiped His feet with her hair, whose brother Lazarus was sick. Therefore his sisters sent unto Him, saying.” We now understand whither it was they sent, namely, where the Lord was; for He was away, as you know, beyond the Jordan. They sent messengers to the Lord to tell Him that their brother was ill. He delayed to heal, that He might be able to raise to life. But what was the message sent by his sisters? “Lord, behold, he whom You love is sick.” They did not say, Come; for the intimation was all that was needed for one who loved. They did not venture to say, Come and heal him: they ventured not to say, Command there, and it shall be done here. And why not so with them, if on these very grounds the centurion's faith was commended? For he said, “I am not worthy that You should enter under my roof; but speak the word only, and my servant shall be healed.” No such words said these women, but only, “Lord, behold, he whom You love is sick.” It is enough that You know; for You are not one that loves and forsakes. But says some one, How could a sinner be represented by Lazarus, and be so loved by the Lord? Let him listen to Him, when He says, “I came not to call the righteous, but sinners.” For had not God loved sinners, He would not have come down from heaven to earth.
6. “But when Jesus heard [that], He said, This sickness is not unto death, but for the glory of God, that the Son of God may be glorified.” Such a glorifying of Himself did not add to His dignity, but benefited us. Hence He says, “is not unto death,” because even that death itself was not unto death, but rather unto the working of a miracle whereby men might be led to faith in Christ, and so escape the real death. And mark how the Lord, as it were indirectly, called Himself God, for the sake of some who deny that the Son is God. For there are heretics who make such a denial, that the Son of God is God. Let them hearken here: “This sickness,” He says, “is not unto death, but for the glory of God.” For what glory? For the glory of what God? Hear what follows: “That the Son of God may be glorified.” “This sickness,” therefore, He says, “is not unto death, but for the glory of God, that the Son of God maybe glorified thereby.” By what? By that sickness.
7. “Now Jesus loved Martha, and her sister Mary, and Lazarus.” The one sick, the others sad, all of them beloved: but He who loved them was both the Saviour of the sick, nay more, the Raiser of the dead and the Comforter of the sad. “When He heard therefore that he was sick, He abode then two days still in the same place.” They sent Him word: He abode where He was: and the time ran on till four days were completed. And not in vain, were it only that perhaps, nay that certainly, even the very number of days has some sacramental significance. “Then after that He says again to His disciples, Let us go into Judea:” where He had been all but stoned, and from which He had apparently departed for the very purpose to escape being stoned. For as man He departed; but returned as if in forgetfulness of all infirmity, to show His power. “Let us go,” He said, “into Judea.”
Source: Tractates on the Gospel of John (New Advent)