Arabian Proverb, He Who Knows Not, He Who Knows, Lady Isabel Burton

“An Arabian proverb says there are four sorts of me:/He who knows not and knows not he knows not: he is a fool – shun him./He who knows not and knows he knows not: he is simple – teach him./He who knows and knows not he knows: he is asleep – wake him;/He who knows and knows he knows: he is wise – follow him.” - Lady Isabel Burton

Found in Treasury of Women's Quotations, by Carolyn Warner, page 3.