Rather than trying to tie up all the uncertainties and challenges your hearers are facing into a neat little bow, you acknowledge the difficulties they face...even after the resurrection.
The promise you will make, which brings about the presence of Christ and creates rejoicing, is the peace Jesus brought to the disciples that night behind locked doors.
Like the women who came despite their questions, your hearers will gather despite their uncertainties, and they will be looking for a word of honest hope.
Their hearts burned, their feet ran, and their mouths opened. “The Lord is risen, indeed!” they confessed, because this is what Easter does: It makes confessors.
John chose to write these things for a specific purpose: “So that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in His name."
After teaching his disciples many things about himself, the world, and the things to come, Jesus concluded his last evening with his disciples in prayer to the Father. And he concluded his prayer with the words in this text. As the old saying goes, you can learn a lot about a man by listening in on his prayers.
When you are not experiencing this kind of tribulation, the promise of “you will” hardly seems comforting. But when you are in the midst of it—when the pressure of this world is bearing down on you—it is comforting to know it has not caught God unawares.
We also have reasons to grieve, and it should not be hard to think of causes for sorrow in your congregation. But, because of the Resurrection, we do not grieve as those without hope (1 Thessalonians 4:13-18). Our joy is a gift here and now, but it will not be complete until Jesus’ return.
Jesus makes two extraordinary claims in this text. One has to do with His relationship to the Father. The other has to do with His relationship to His followers. The preacher on this text would do well to recognize the magnitude of these two claims, and then choose one (or both) to proclaim without apology or reservation.