Optimism Quotes - Page 24
Helen Keller (2012). “Optimism”, p.5, Simon and Schuster
Helen Keller (2013). “Optimism: An Essay”, p.29, The Floating Press
George Santayana (2015). “Character and Opinion in the United States”, p.11, Sheba Blake Publishing
"An Essay on the Aristocratic Radicalism of Friedrich Nietzsche". Essay by Georg Brandes (1889), as translated in "Friedrich Nietzsche" by A.G. Chater (p. 21), 1914.
Erich Fromm (2013). “The Anatomy of Human Destructiveness”, p.725, Open Road Media