A world where much is to be done, and little is to be known
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“preached a Gospel to them,—as all like him always do. The highest Gospel he preached we may describe as a kind of Moral Prudence: "in a world where much is to be done, and little is to be known," see how you will do it! A thing well worth preaching. "A world where much is to be done, and little is to be known:" do not sink yourselves in boundless bottomless abysses of Doubt, of wretched god-forgetting Unbelief;—you were miserable then, powerless, mad: how could you do or work at all? Such Gospel Johnson preached and taught;—coupled, theoretically and practically, with this other great Gospel, "Clear your mind of Cant!"” source