“Let a fool be made serviceable according to his folly.”

“Just as the good physician should go and offer his services where the sick are most numerous, so, said [ Diogenes], the man of wisdom should take up his abode where fools are thickest in order to convict them of their folly and reprove them.”

Dio Chrysostom (40–120) Greek philosopher

“There are three kinds of fools in this world, fools proper, educated fools and rich fools. The world persists because of the folly of these fools.”

Swami Narayanananda (1902–1988) Indian guru

“Love is the wisdom of the fool and the folly of the wise.”

Samuel Johnson (1709–1784) English writer

“A fool’s brain digests philosophy into folly, science into superstition, and art into pedantry.”

George Bernard Shaw (1856–1950) Irish playwright

“Fear that makes faith may break faith; and a fool Is but in folly stable.”

Algernon Charles Swinburne (1837–1909) English poet, playwright, novelist, and critic

“Because no battle is ever won. They are not even fought. The field only reveals to man his own folly and despair, and victory is an illusion of philosophers and fools. Be different!”

Kim Peek (1951–2009) American savant, model for the protagonist of the film "Rain Man"

“Let a fool hold his tongue and he will pass for a sage.”
Taciturnitas stulto homini pro sapientia est.

Publilio Siro Latin writer

“True wisdom is less presuming than folly. The wise man doubteth often, and changeth his mind; the fool is obstinate, and doubteth not; he knoweth all things but his own ignorance.”

Akhenaten 18th dynasty pharaoh

“The ultimate result of shielding men from the effects of folly, is to fill the world with fools.”

Herbert Spencer (1820–1903) English philosopher, biologist, sociologist, and prominent classical liberal political theorist