She [Alice] went on "And how do you know that you're mad?" "To begin with," said the Cat, "a dog's not mad. You grant that?" "I suppose so," said Alice. "Well, then," the Cat went on, "you see, a dog growls when it's angry, and wags it's tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."
What do you suppose is the use of a child without any meaning? Even a joke should have some meaning-- and a child's more imporant than a joke, I hope. You couldn't deny that, even if you tried with both hands.
Now, here, you see, it takes all the running you can do, to keep in the same place. If you want to get somewhere else, you must run at least twice as fast as that!