"Calmness, not skill, is the sign of a mature samurai. A samurai should neither be arrogant or egotistical." - Tsukahara Bokuden
A day or so ago at the Nagoya Sumo Basho, both Hakuho and Harumafuji lost to maegashira or the lowest ranked wrestlers at the tournament. When a maegashira beats a yokozuna it is called kimboshi. Both Hakuho and Harumafuji are Sumo Grand Champions or yokozuna. A yokozuna is supposed to be the pinnacle of sumo and a grand champion must always conduct themselves with the highest amount of decorum and poise as they are sumo. At the highest level of sumo, a yokozuna is supposed to be in a state of calmness and composure or (安定した). The ability to calm down is called ochitsuku (落ち着く). Both states of calmness and the act of becoming calm are the marks of true mastery.
Last night when Hakuho and Harumafuji lost, they both showed a lack of composure. When Hakuho's bout started to change in favor of his opponent Ikioi, Hakuho showed a lack of ability to ochitsuki when he uncharacteristically lost his cool and tried to force the win and thus lost his balance. Harumafuji also lost in grand fashion as Yoshikaze threw him down and as the cameras followed him to the dressing rooms he showed he wasn't anteishita as he was seen getting angry and snapping at one of his subordinates.
Anyone can be defeated by anyone, but only a true master can defeat themselves. When one reaches this level, they get a certain air about them - they seem to have a sense of calm and the ability to stay calm. A person who only values skill or the physicality of a art will always have a sense of discord about them. Whether a person with mastery wins or loses, they are still calm. People with a low level of mastery are always turbulent vacillating between highs and lows.
As Tsukahara Bokuden said, "Calmness, not skill, is the sign of a mature samurai. A samurai should neither be arrogant or egotistical." Thus, we train not just for physical mastery but mastery over every aspect of ourselves.