“Who can exhaust a man? Who knows a man’s resources?”

“A man who knows how little he knows is well, a man who knows how much he knows is sick.”

Witter Bynner (1881–1968) American author

“Who can know heaven except by its gifts? and who can find out God, unless the man who is himself an emanation from God?”
Quis cœlum possit nisi cœli munere nosse? Et reperire deum nisi qui pars ipse deorum est?

Marcus Manilius Astronomica

“The Man who says he can, and the man who says he can not.. Are both correct”

Confucius (-551–-479 BC) Chinese teacher, editor, politician, and philosopher

“A man who comes to be hanged,' pursued Jasper, impartially, 'has the satisfaction of knowing that he has brought society to its last resource. He is a man of such fatal importance that nothing will serve against him but the supreme effort of law. In a way, you know, that is success.”

George Gissing (1857–1903) English novelist

“Peter Mandelson is the only man I know who can skulk in broad daylight.”

Simon Hoggart (1946–2014) English journalist and broadcaster

“A paranoid man is a man who knows a little about what's going on.”

William S. Burroughs (1914–1997) American novelist, short story writer, essayist, painter, and spoken word performer

“From my point of view, he can be called a remarkable man who stands out from those around him by the resourcefulness of his mind, and who knows how to be restrained in the manifestations which proceed from his nature, at the same time conducting himself justly and tolerantly towards the weaknesses of others.”

G. I. Gurdjieff (1866–1949) influential spiritual teacher, Armenian philosopher, composer and writer

“One man that has a mind and knows it can always beat ten men who haven't and don't.”

George Bernard Shaw The Apple Cart

“Life's battles don't always go to the stronger or faster man. But sooner or later the man who wins, is the man who thinks he can.”

Bruce Lee (1940–1973) Hong Kong-American actor, martial artist, philosopher and filmmaker