Certainly, by the name of the world one may understand the impiety of this world, that is, the impiety of the friends of this world. Therefore the Apostle James says in his Epistle: "Whoever wants to be a friend of the world makes himself an enemy of God" (Jas 4:4). And this enmity against God led them not to spare even His Only-begotten Son.
I also think that the words spoken above should more rightly be understood in relation to this final end: "A little while, and you will no longer see Me, and again a little while, and you will see Me." For the "little while" is the whole period during which the present age endures. For this reason the same Evangelist says in his Epistle: "It is the last hour" (1 Jn 2:18).
Therefore He also added: "because I go to the Father." This must be referred to the first part of the saying, where He said, "A little while, and you will no longer see Me. " not to the second, where He said, "and again a little while, and you will see Me." For because of His departure to the Father it had to happen that they could not see Him.
Thus the saying was not spoken because He would die and, until He rose, be hidden from their sight. It was spoken because He was about to go to the Father. He did this after His Resurrection, when, after conversing with them for forty days, He ascended into heaven (cf. Acts 1:3-9).
Therefore He said, "A little while, and you will no longer see Me" (Jn 16:19), to those who then saw Him bodily. He was about to depart to the Father. Afterward they would no longer see Him as mortal, as they saw Him when He said this to them.
What He added, "and again a little while, and you will see Me," was His promise to the whole Church. So He promised the whole Church: "And behold, I am with you always, to the end of the age" (Mt 28:20). The Lord does not delay in fulfilling His promise. Soon we shall see Him, when we shall ask nothing and inquire about nothing. For nothing will remain to be desired, and nothing hidden will remain about which one might ask.
This "little while" seems long to us because this brief span is still continuing. But when it is finished, then we shall feel how brief it was. Therefore let our joy not be the joy with which the world is filled, of which it is said, "but the world will rejoice" (Jn 16:20).
And yet, while that for which our desire longs is being born, let our sorrow not be without joy. As the Apostle says: "Rejoice in hope; be patient in tribulation" (Rom 12:12). For even the woman in labor, to whom we are compared, rejoices more over the child soon to be born than she grieves over the pain she endures.
Let this be the end of the present discourse. The words that follow raise a very difficult question. They should not be confined within narrow limits of time, so that, if the Lord wills, they may be considered with greater profit.