"Some thoughts on the real world by one who glimpsed it and fled". Bill Watterson's commencement speech at the Kenyon College in Gambier, Ohio, www.graduationwisdom.com. May 20, 1990.
John Greenleaf Whittier (2012). “Religious Poems, Part 2., from Poems of Nature, Poems Subjective and Reminiscent and Religious Poems Volume II., the Works of Whittier”, p.90, tredition
Miyamoto Musashi, Yamamoto Tsunetomo, Inazo Nitobe (2010). “Honor: Samurai Philosophy of Life - The Essential Samurai Collection; The Book of Five Rings, Hagakure: The Way of the Samurai, Bushido: The Soul of Japan.”, p.63, Bottom of the Hill