– D. Elton Trueblood
– Greek proverb
– John Christian Bovee
– Thomas Peters
– Aaron Hill
– Nelson Henderson
– Charles Dickens
– Greek Proverb
– Persian Proverb
– Rudyard Kipling
– Emily Elizabeth Dickinson
– Thomas Jefferson
– Dr.
– The Hitopadesa
– Alexander Pope, Essay on Man
– Bhartrihari
– Benjamin Franklin
– John Constable
– Phillip Chesterfield
– Thomas Hood (1799-1845), in the poem called No!
– Charles Dickens, Great expectations
– Mehmet Murat ildan