Michel de Montaigne, William Hazlitt (1860). “The Works of Michael de Montaigne: Comprising His Essays, Letters, and Journey Through Germany and Italy”, p.352
William Walker Atkinson (2016). “WILLIAM WALKER ATKINSON Ultimate Collection – 58 Books in One Volume: The Power of Concentration, The Key To Mental Power Development & Efficiency, Thought-Force in Business and Everyday Life, The Secret of Success, Mind Power, Raja Yoga, Self-Healing by Thought Force…”, p.6196, e-artnow