I cannot prove the existence of heaven.
I accept its reality by faith, on the authority of Jesus Christ: “In my Father’s house are many mansions; if it were not so, I would have told you. I go to prepare a place for you.”
For that matter, if I were a twin in the womb, I doubt that I could prove the existence of earth to my mate. He would probably object that the idea of an earth beyond the womb was ridiculous, that the womb was the only earth we’d ever know.
If I tried to explain that earthlings live in a greatly expanded environment and breathe air, he would only be skeptical. After all, a fetus lives in water; who could imagine its being able to live in a universe of air? To him such a transition would seem impossible.
It would take birth to prove the earth’s existence to a fetus. A little pain, a dark tunnel, a gasp of air – and then the world outside! Green grass, laps, lakes, the ocean, horses (could a fetus imagine a horse?), rainbows, walking, running, surfing, ice-skating. With enough room that you don’t have to shove, and a universe beyond.
Joe Bayly, The Last Thing We Talk About