Mark Twain Quotes about Gratitude

Mark Twain, Caroline Thomas Harnsberger (2009). “Mark Twain at Your Fingertips: A Book of Quotations”, p.482, Courier Corporation
Mark Twain (2010). “Autobiography of Mark Twain, Volume 1: The Complete and Authoritative Edition”, p.180, Univ of California Press
Mark Twain, General Press (2016). “The Complete Works of Mark Twain: All 13 Novels, Short Stories, Poetry and Essays”, p.3668, GENERAL PRESS
Pudd'nhead Wilson ch. 3, "Pudd'nhead Wilson's Calendar" (1894)