R. A. Torrey, Edward D. Andrews (2016). “CHRISTIAN LIVING: How to Succeed in the Christian Life [Updated and Expanded]”, p.259, Christian Publishing House
Benjamin Franklin, William-Temple Franklin (1818). “Memoirs of the Life and Writings of (the Same), Continued to the Time of His Death by William Temple Franklin. - London, H. Colburn 1818”, p.249
"A Dictionary of Thoughts: Being a Cyclopedia of Laconic Quotations from the Best Authors of the World, Both Ancient and Modern" by Tryon Edwards, New York, Cassell publishing company, (p. 212), 1891.