The Phantom Tollbooth
"How terribly confusing," he [the Dodecahedron] cried. "Everything here is called exactly what it is. The triangles are called triangles, the circles are called circles, and even the same numbers have the same name. Why, can you imagine what would happen if we named all the twos Henry or George or Robert or John or lots of other things? You'd have to say Robert plus John equals four, and if the four's name were Albert, things would be hopeless." (14.22)
"Because, my young friends," he [the blank man] muttered sourly, "what could be more important than doing unimportant things? If you stop to do enough of them, you'll never get to where you're going." He punctuated his last remark with a villainous laugh. (17.14)
"I'm the demon of insincerity," he sobbed. "I don't mean what I say, I don't mean what I do, and I don't mean what I am. Most people who believe what I tell them go the wrong way, and stay there, but you and your awful telescope have spoiled everything. I'm going home." And, crying hysterically, he stamped off in a huff.
"It certainly pays to have a good look at things," observed Milo as he wrapped up the telescope with great care. (17.43-44)