One of the most fascinating scenes in the New Testament—to my mind, at least—is the ascension of Jesus Christ. As Luke records the event in the book of Acts, he notes that after his resurrection, Jesus appeared to his disciples over a period of forty days and on one occasion:
They gathered around him and asked him, “Lord, are you at this time going to restore the kingdom to Israel?”
He said to them: “It is not for you to know the times or dates the Father has set by his own authority. But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.”
After he said this, he was taken up before their very eyes, and a cloud hid him from their sight.
They were looking intently up into the sky as he was going, when suddenly two men dressed in white stood beside them. “Men of Galilee,” they said, “why do you stand here looking into the sky? This same Jesus, who has been taken from you into heaven, will come back in the same way you have seen him go into heaven.” (Acts 1:6-11).
And that was the last they saw of Jesus. It was their final, unceremonious goodbye. And yet, apparently, there was no weeping or wailing. No one cried. No one mourned. In fact, the disciples simply got to work building the church and joyfully proclaiming the Good News.
What a contrast between this and when Jesus died six weeks earlier. And yet, from the standpoint of saying goodbye, at least as far as anyone could tell at the time, the situation was no different. A beloved friend was leaving for good. Why such a different response?
Was it the manner of death? This can’t be the explanation, since it is the loss of our loved ones that we mourn, not their manner of death. This is reflected in 
the (very reasonable) common expression, “I’m sorry for your loss.” We never say, “I’m sorry your loved one died the way they did.” Yes, an especially painful or violent death may exacerbate the pain of loss. But the essence of sorrow regards the loss of the person, not how they died. And yet, when Jesus ascended, the disciples lost their friend. So why no mourning?
Was it the presence of Jesus’ dead body that made his death so much more painful than his ascension? No, this can’t be it. If your loved one were to die in such a way that their body is out of sight or irretrievable (e.g., sunken in the ocean depths, lost in space, etc.) you would mourn every bit as much as if their lifeless body was present. The presence of a corpse may make some psychological difference (for better or worse), but that’s not the source of our sorrow. Again, it is the loss of the person we mourn.
Or maybe the difference lies in the fact that by the time Jesus ascended, he had proven he was the Messiah, that the disciples’ personal investment in him was not in vain, and that their trust in him was vindicated. Perhaps this is why
the disciples didn’t mourn his ascension. Again, this doesn’t account for the fact that, just as in the case of a physical death, by ascending Jesus was leaving them for good.
Or was he? It seems to me that the key to understanding the different responses is that Jesus’ ascension proved his departure was only temporary. That by his resurrection he proved that he had conquered death and that he could be trusted in his promise that he was going to return and bring about his everlasting kingdom. This meant, again, that the goodbye was not permanent but only temporary.
So the difference has to do with Gospel hope, something that the disciples definitely did not have immediately after Jesus was crucified and buried. In fact, they had lost all hope. But with the fact that the ascension occurred after his resurrection made all the difference. Moreover, his resurrection proved that all death is conquered and that, as Christians, all of our goodbyes are only temporary. And this is why the Apostle Paul would later dare to mock death, saying, “Where, O death, where is your victory? Where, O death, where is your sting?” (1 Cor. 15:55).
Of course, I am not saying that our mourning the death of friends and loved ones is not rational or that we lack faith in doing so. Rather, we mourn with hope. And, as Christians, we understand that our goodbyes really are temporary—that we, too, ascend after death and, like our Lord, we go to await our final reunion with the people of God. That is Gospel hope, and it makes all the difference in the world.