If a civil word or two will render a man happy, he must be a wretch indeed who will not give them to him.
Louis XIV (1638-1715) French monarch (1643-1715) [Louis the Great, the Sun King)
(Attributed)
(Source)
Quoted in William Seward, Anecdotes of Distinguished Persons, Vol 4, 5th ed. (1804).
Also attributed to William Penn, albeit a century later; see http://bit.ly/2myyhqH.