Doubt Quotes - Page 17
Sri Ramana Maharshi (1991). “Be As You Are: The Teachings of Sri Ramana Maharshi”, p.196, Penguin UK
Napoleon Hill (2012). “Think & Grow Rich”, p.245, Courier Corporation
"Letters of C. S. Lewis". Book by C. S. Lewis, p. 285, 1959.
Anthony Eden (1960). “The Memoirs of Full Circle”
"Dictionary of Burning Words of Brilliant Writers" by Josiah Hotchkiss Gilbert, (p. 599), 1895.