“He [Genghis Khan] tried to teach them that the first key to leadership was self-control, particularly the mastery of pride, which was something more difficult, he explained, to subdue than a wild lion, and anger, which was more difficult to defeat than the greatest wrestler. He warned them that “if you can’t swallow your pride, you can’t lead.” He admonished them never to think of themselves as the strongest or smartest. Even the highest mountain had animals that step on it, he warned. When the animals climb to the top of the mountain, they are even higher than it is.” (Weatherford. 2004, p.125).
Weatherford, J. (2004) Genghis Khan and the Making of the Modern World. New York, NY: Broadway Books.