Henry Ward Beecher, Truman Jeremiah Ellinwood (1872). “The Original Plymouth Pulpit: Sermons of Henry Ward Beecher in Plymouth Church, Brooklyn”, p.169
Attributed to Aristotle in Diogenes Laertius "The Lives and Opinions of Eminent Philosophers" translated by C. D. Yonge and Henry G. Bohn (p. 188), 1853.