After this I looked, and behold, a great multitude that no one could number, from every nation, from all tribes and peoples and languages, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands, and crying out with a loud voice, Salvation belongs to our God who sits on the throne, and to the Lamb! -Rev 7:9-10
Every day people — immortal souls — come in and out of our lives, all in one of two classes: believers and unbelievers, wheat and chaff, sheep and goats, circumcised hearts and uncircumcised hearts. Some move away and we muse on whether we will ever see them again. We hope and pray they will join us in that vast throng pictured in Revelation 7 (and repent that we weren’t a better witness). All on this tiny globe hurtling through infinite space.
It’s far too vast to contemplate. Eventually one ends up back in the same spot:
O Lord, my heart is not lifted up;my eyes are not raised too high; I do not occupy myself with things too great and too marvelous for me. -Psalm 131:1