I think it is certain that "the concept of a double-edged sword" represents a part of cultural peculiarity in kendo (swordsmanship), which is one of the athletic cultures. I would like to refer this study to the area considered to be core of "concept of a double-edged sword." The core area that I mean is greatly pertinent to that the attribute of a double-edged sword is comprehended in the phase of oppositeness. In this thesis, I aim to grasp the phase of oppositeness described in the "concept of a double-edged sword," and to clarify the disclosed logic underneath it.
The points that have been cleared in this research are as follows;
1. The "concept of a double-edged sword" in the swordsmanship had been relevant with the phases of oppositeness, for instance in the relationship between heart and the body or he and myself.
2. Traditional Japanese "concept of a double-edged sword" that has been handed down from Ancient times is represented by Futsuno-Mitamano Tsurugi and Kusanagino Tsurugi. Antecedently, phases of oppositeness called celestial sphere and terrestrial sphere existed and the deity of these two swords originated in the notion of integrating these phases of oppositeness.
3. Considering the Chinese concept of a double-edged sword, which is the origin of "the concept of a double-edged sword" in Japan, people in China were aware of the nature of transcendency which could integrate the phases of oppositeness. The oppositeness has been described in a notion represented by yin and yang, in which people thought two objects did not simply oppose each other, but they contrarily cooperated or collaborated mutually. This was the most fundamental view in ancient China, which meant every creature in the world existed opposing each other but mutually collaborating, to change, to rotate, and to recreate/decease. This view was called "Logic of Oppositeness." It is also called "logic of divination lore." The deity of a double-edged sword had developed with this logic in the background.
4. Taking it into the consideration, the notion of celestial and terrestrial sphere in the "Concept of a double-edged sword" that has been traditionally passed down from the ancient Japan, and the notion of heart and body, or he and myself in the swordsmanship characterize the relation of opposite status. It is manifest that "the logic of oppositeness" described in the Chinese thought exists latently in the bottom of "the concept of a double-edged sword" in Japan, though it is not as explicit as the logic of divination lore in China.
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