John Chrysostom

"And ye now therefore have sorrow-but I will see you again, and your sorrow shall be turned into joy." Then, to show that He shall die no more, He saith, "And no man taketh it from you."

Homily on the Gospel of John 79 ↗

Cyril of Alexandria

In like manner then will your suffering also not fail to meet its reward. For you will rejoice when you see a new child born into the world, incorruptible and beyond the reach of death. Plainly He alludes to Himself here. He tells them that the joy of heart that they will have in Him cannot be taken away from them or lost. For, as Paul says, or rather as the Very Truth Itself implies, having died once for all, He dieth no more. The joy of heart then that rests upon Him hath in very truth a sure foundation. …

Commentary on the Gospel of John, Book 11 ↗

Theophylact of Ohrid

So here too, by the pangs of birth we understand the sorrow of the apostles, and by the joy — their consolation after the resurrection, and again by the loosing of the pangs — the destruction of Hades, and by the birth — the resurrection of the Firstborn from the dead. But we no longer understand by the mother — Hades; for it was not Hades that rejoiced, but the apostles rejoiced, and they rejoiced with such joy that no one took from them. …

Commentary on John ↗

Augustine of Hippo

For I think that His words, "But I will see you again, and your heart shall rejoice, and your joy no man taketh from you," are not to be referred to the time of His resurrection, and when He showed them His flesh to be looked at and handled; but rather to that of which He had already said, "He that loveth me, shall be loved of my Father; and I will love him, and will manifest myself to him." For He had already risen, He had already shown Himself to them in the flesh, and He was already sitting at the right hand of the Father, when …

Tractates on John 101 ↗

Thomas Aquinas

2134 Here he draws the parallels. As regards the present sorrow the apostles were experiencing he says, So you have sorrow now, now being from the time of my passion, and the sorrow is over my death: "What is this conversation which you are holding with each other as you walk and look sad?" (Lk 24:17). Or now, during your entire life, you have sorrow: "You will weep and lament" (16:20). As regards their future joy he says, but I will see you again. …

Commentary on John ↗

Bonaventure

And you therefore. Here is the adaptation of the example, that they would similarly be saddened at Christ's passion, but would rejoice at his glorification or resurrection: on account of which he says: And you therefore now indeed have sorrow, and this on account of the departure of the bridegroom; Matthew 9: "The days will come when the bridegroom shall be taken from them: and then they shall mourn." But that sorrow will last but a little while: therefore he says: I will see you again, and your heart shall rejoice: below, chapter …

Commentary on John, Chapter 16 ↗