– William Shakespeare, Romeo, in Romeo and Juliet, act 1, sc. 1.
– Joey Adams
– Abraham Lincoln
– Albert Camus
– Vincent Canby, The New York Times, November 11, 1984
– American Proverb
– Bible
– Bible, New Testament, James, Chapter 1, Verse 12
– Sir Martin Archer Shee
– Feltham
– The Talmud
– Jack Handey Deep Thoughts
– William Penn
– William Cowper
– Jean Kerr
– Ralph Nader
– John Locke
– Carlyle
– Unknown
– William Shakespeare
– Daniel Defoe