This is a quote from the book "Animal Farm" by George Orwell
...and fro all day with blocks of stone if by doing so they could raise the walls another foot. Boxer would even come out at nights and work for an hour or two on his own by the light of the harvest moon . In their spare moments the animals would walk round and round the half-finished mill, admiring the strength and perpendicularity of its walls and marvelling that they should ever have been able to b uild anything so imposing. Only old Benjamin refused to grow enthusiastic about the windmill, though, as usual, he would utter nothing beyond the cryptic remark that donkeys live a long time.

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