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The following is the epitaph placed on his daughter’s tomb by Mark Twain:
Warm summer sun,
Shine kindly here.
Warm southern wind,
Blow softly here.
Green sod above,
Lie light, lie light.
Good night, dear heart,
Good night, Good night.
The Bard on the Hill 
Tender words, and just a few = big impact
Thank you for sharing these.
Writ by Robert Richardson from the poem ‘Annette’
Thanks for the information! I didn’t know that. I did a bit of research after reading your comment and found that Twain had forgotten whose poem it was and Richardson’s name was later added to the headstone as the author.