If You Prove Right and I Prove Wrong

A poem on the afterlife in anticipation of the 100th anniversary of Mark Twain’s death:
Mark Twain and his friend, Julia (Mrs. Thomas K.) Beecher, had a dispute about the afterlife. Julia Beecher was the wife of the clergyman who married the Clemens. Twain and Beecher entered into a wager on the afterlife that Twain memorialized with this poem.
If you prove right and I prove wrong,
     A million years from now,
In language plain and frank and strong
      My error I’ll avow
To your dear waking face.
If I prove right, by God His grace,
     Full sorry I shall be,
For in that solitude no trace
     There’ll be of you and me
           Nor of our vanished race.
A million years, O patient stone,
     You’ve waited for this message.
Deliver it a million hence;
     [Survivor pays expressage.]
                 – Mark Twain –
Twain wrote this on July 2, 1895. Twain’s handwritten, slightly marked up, draft is extant. The draft also includes a note, written later, to Julia Beecher. Twain wrote the final version of the three verses on three stones, stones that Beecher selected. They are now at Elmira College.
The Mark Twain forum has been discussing Mark Twain’s poetry and a post from Gregg Camfield reminded me of this wonderful little poem.