Mark Twain Quotes about Struggle

Mark Twain (2005). “The Devil's Race-Track: Mark Twain's "Great Dark" Writings”, p.213, Univ of California Press
Mark Twain, General Press (2016). “The Complete Works of Mark Twain: All 13 Novels, Short Stories, Poetry and Essays”, p.1257, GENERAL PRESS
Mark Twain (1929). “Stormfield Edition of the Writings of Mark Twain [pseud.].: Mark Twain's speeches”