A horse and A donkey

A horse was selected by Xuanzang in Tang Dynasty to go on a pilgrimage for Buddist scriptures. The horse was ridden by the famous monk to leave China for India, starting a long long journey. They made an arduous expedition and came back with what they wanted to get---the scriptures.After returning from India, the horse came to see his friend donkey,  telling him all the difficulties and happiness he experienced on the journey. The donkey were very happy to hear about that and asked the horse how he could travel so long distance.The horse replied,"Actually we both walked the same distance. The only difference, I think, is that I set up a target and try my best to achieve it. And you keep going in circles, with your eyes blindfolded. "