Aesop's Fables. Translated by Rev. George Fyler Townsend. 1860.

A Mule, frolicsome from lack of work and from too much corn, galloped about in a very extravagant manner, and said to himself, "My father surely was a high-mettled racer, and I am his own child in speed and spirit."

On the next day, being driven a long journey, and feeling very wearied, he exclaimed in a disconsolate tone, "I must have made a mistake; my father, after all, could have been only a donkey."