The Phantom Tollbooth
"As you can see, that leaves almost no time for brooding, lagging, plodding, or procrastinating, and if we stopped to think or laugh, we'd never get nothing done."
"You mean you'd never get anything done," corrected Milo.
"We don't want to get anything done," snapped another angrily; "we want to get nothing done, and we can do that without your help." (2.65-67)
Milo's eyes opened wide, for there in front of him was a large dog with a perfectly normal head, four feet, and a tail – and the body of a loudly ticking alarm clock.
"What are you doing here?" growled the watchdog. (2.81-82)
"You see," he [Tock] continued, beginning to feel better, "once there was no time at all, and people found it very inconvenient. They never knew whether they were eating lunch or dinner, and they were always missing trains. So time was invented to help them keep track of the day and get places where they should. […] [I]t seemed as if there was much more [time] than could ever be used. […] People wasted it and even gave it away. Then we were given the job of seeing that no one wasted time again". (3.11)