"...and you don't even have to sleep alone, you don't even have to sleep at all; and so, all you have to do is show the stick to the dog now and then and say, 'Thank God for nothing.'"

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He became quicker of movement than the other dogs, swifter of foot, craftier, deadlier, more lithe, more lean with ironlike muscle and sinew, more enduring, more cruel more ferocious, and more intelligent. He had to become all these things, else he would not have held his own nor survived the hostile environment in which he found himself.

— Jack London