What is the poem you refer to as one of your favorites in the Heaven book and who wrote it?
I once scorned ev’ry fearful thought of death,
When it was but the end of pulse and breath,
But now my eyes have seen that past the pain
There is a world that’s waiting to be claimed.
Earthmaker, Holy, let me now depart,
For living’s such a temporary art.
And dying is but getting dressed for God,
Our graves are merely doorways cut in sod.
Calvin Miller, The Divine Symphony (Minneapolis: Bethany, 2000), 139.
For more information on the subject of Heaven, see Randy Alcorn's book Heaven.