This is a quote from the book "Animal Farm" by George Orwell
... it a point of honour not to let it be seen that he was in pain. In the evenings he would admit privately to Clover that the hoof troubled him a great deal. Clover treated the hoof with poultices of h erbs which she prepared by chewing them, and both she and Benjamin urged Boxer to work less hard. “A horse’s lungs do not last for ever,” she said to him. But Boxer would not listen. He had, he said, only one real ambition left — to see the windmill well under way before he reached the age for retirement.

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