Mozi was angry at Gengzhuzi, his pupil. Gengzhuzi wondered, "Am I inferior to others?" Mozi asked him, "Supposed I am going up to Mt. Taiheng, carried by a good horse or an ox, which will you whip?" Gengzhizi answered, "I will certainly whip the horse." Mozi continued, "Why the horse?" Gengzhuzi said, "The good horse is worth urging on." Mozi said, "I think you are worth urging on. That is why I am angry at you." The words cast light on Gengzhuzi.