NOTES for Luk 20:38
At times the aphoristic force of Jesus' sayings is so bright that something we thought we already understood unambiguously is lit up for us in a new way. The point is that we look from our human point of view, while Jesus looks from the point of view of the Heavenly Father.
So it is in this case: people have always considered death almost the main event in life, feared this event, tried to understand what happens in it... Even now Christians continue to argue seriously about whether one can pray for the dead, whether repentance after death is possible, and so on, thereby giving death some enormous, almost fatal significance.
But Jesus puts everything in its place with one phrase. From God's point of view, and this is the only true point of view, all this is our vanity, because God has no dead; with Him all are alive. This means that our physical death changes nothing in the most important thing: our relationship with God. What happens then and how it happens is secondary.