“The fool has one great advantage over a man of sense — he is always satisfied with himself.”
Napoleon : In His Own Words (1916)
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Napoleon I of France 259
French general, First Consul and later Emperor of the French 1769–1821Related quotes

“He had the satisfied countenance of a man who has never succeeded in boring himself.”
Page 45.
The Last Testament of Oscar Wilde (1983)

“A man never knows what a fool he is until he hears himself imitated by one.”
Quoted by Max Beerbohm in Hebert Beerbohm Tree: Some Memories of Him and of His Art Collected by Max Beerbohm http://books.google.com/books?id=wM08AAAAIAAJ&q="A+man+never+knows+what+a+fool+he+is+until+he+hears+himself+imitated+by+one"&pg=PA312#v=onepage (1920).

Letter to Denis O'Bryen (16 July 1800), quoted in L. G. Mitchell, Charles James Fox (London: Penguin, 1997), p. 167.
1800s

Reflections
Original: (fr) M... me disait que j'avais un grand malheur: c'était de ne pas me faire à la toute-puissance des sots. Il avait raison, et j'ai vu qu'en entrant dans le monde, un sot avait de grands avantages, celui de se trouver parmi ses pairs. C'est comme frère Lourdis dans le temple de la Sottise.
Original: (fr) Maximes et Pensées, #197

“There is no liar like the one who lies to himself. He has a fool indeed for an audience.”
Source: Short fiction, Dragonfield and Other Stories (1985), The Bull & the Crowth (p. 122)

“The fool doth think he is wise, but the wise man knows himself to be a fool.”
Touchstone, Act V, scene i
Source: As You Like It (1599–1600)

“The fool doth think he is wise, but the wise man knows himself to be a fool.”
Touchstone, Act V, scene i
Misattributed

“A man has to live with himself, and he should see to it that he always has good company.”
As quoted in Ethics and Citizenship (1924) by John Walter Wayland, p. 208.