In ancient times, a caravan driver set forth on a journey, driving before him a Donkey and a Mule, both well laden. The Donkey, as long as he traveled along the plain, carried his load with ease, but when he began to ascend the steep path of the mountain, felt his load to be more than he could bear.
He entreated his companion to relieve him of a small portion, that he might carry home the rest; but the Mule paid no attention to the request. The Donkey shortly afterwards fell down dead under his burden.
Not knowing what else to do in so wild a region, the caravan driver placed upon the Mule the load carried by the Donkey in addition to his own, and at the top of all placed the hide of the Donkey, after he had skinned him.
The Mule, groaning beneath his heavy burden, said to himself: "I am getting my just deserts. If I had only been willing to assist the Donkey a little in his need, I should not now be bearing, together with his burden, himself as well."