"The reason, my dear, is that the earth is so solid that other solid things can't get through it.

But when there's a hole, as there is in this case, we drop right down to the center of the world." "Why don't we stop there ?" asked Betsy.
"Because we go so fast that we acquire speed enough to carry us right up to the other end." "I don't understand that, and it makes my head ache to try to figure it out," she said after some thought.

"One thing draws us to the center and another thing pushes us away from it.

But--" "Don't ask me why, please," interrupted the Shaggy Man.

"If you can't understand it, let it go at that." "Do you understand it ?" she inquired.
"All the magic isn't in fairyland," he said gravely.