"The fourfold root of the principle of sufficent reason is "Anything perceived has a cause. All conclusions have premises. All effects have causes. All actions have motives."

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...If there's a noise in the woods, and there's nobody around to hear it, is it really a noise?" "Of course it is," she replied calmly. "How did you reach that conclusion?" Beldin demanded. "Because there's no such thing as an empty place, uncle. There are always creatures around --wild animals, mice, insects, birds --and they can all hear." "But what if there weren't? What if the woods are truly empty?" "Why waste your time talking about an impossibility?

— David Eddings