Ogasawara Family and In/Yo Theory

"A propriety, horsemanship, and archery traditions and technique succeeded by the Ogasawara school are firmly based on the Ying and Yang thought.The Ying and Yang thought was imported from China. Almost 1400 years ago, in Heian ( it means "peace") period in Japan, this thought became a vital foundation of universal scholarship and all natural phenomenon. It has been thought that the universe itself is built up by the Ying and Yang, invisible but mighty power circulation and balance of two conflicting components, e.g. light and shadow, plus and minus, sun and moon etc. A fundamental orientation and mathematics derived from the Ying and Yang thought largely influence the patterns of licensed arrows provided by the Ogasawara school and a field and altar arrangement of ritual archery ceremonies, however, the point that should be specially noted is "Ying and Yang"; shout ( in Japanese, it pronounces "In‐ Yo" ) by the Yabusame archers on horses at the Yabusame ritual ceremony. By shouting In‐Yo, their spirits and souls are able to correspond with the universe in other words almighty God."

The above is from the Ogasawara Family

below is my comment:

In/Yo Theory or the principles of yin and yang come from Chinese Taoism. Taoism arrived in Japan along with Buddhism and Confucianism in the 6th century AD. But Taoism was the weakest of the 3, bearing such a resemblance to the existing shaministic practices and beliefs already in Japan that it only existed in the periphery, and within the mix of the 3 which became knows as Jukyo.

The Ogasawara Family established for us the foundations of what culminated in what we now think of as Traditional Japanese Culture. The In/Yo theory that they used is based on the principles of Taoist thought. In/Yo theory entered Japan within the Jukyo combination of influences from the mainland. Jukyo consists primarily of Confucian Values, Buddhist Ceremonies, and Taoist Principles... pretty much in this order. To the extent that Jukyo is sometimes translated as Confucianism. But in talking with the Japanese about what is Jukyo, the principles described are Taoist; so as stated, Jukyo is Confucian Values, Buddhist Ceremonies, and Taoist Principles, just as this In/Yo Theory used by the Ogasawara Family suggests.

Zen too came to Japan as Buddhism; but quickly, under the descendants of Dogen Zenji (1200-1253) (who brought what we now call Soto Zen Buddhism to Japan) again the Jukyo was incorporated, and along with that indigenous ideas were incorporated into Zen as well. This combination of all, roots from Japan and all the jukyo from the mainland combine in varying ways, and in varying degrees, to create what we now call Traditional Japanese Culture.

The Ogasawara Patriarch most responsible for the strengthening of the Ogasawara Teaching, and establishing it as the Japanese Way was Sadamune Ogasawara (1292-1347). Sadamune studied under the Zen Master Seisetsu Shoho and used these teachings to re-establish Ogawawara-ryu of the time. He took the principles of Zen and incorporated them more strongly into the Jukyo Principles already in place.

The other principles that we think of as Traditional Japanese Culture, come directly from Buddhism and particularly Zen. Zen Masters brought a particular taste and way of practicing to such things as tea, calligraphy, and flower arrangement. They took what for some had been just past times for those outside of the temple, and brought the flavor of the temple back into them, since that's where they came from in the first place.

They also had great influence over warriors of the time who developed their warrior practices into 'do' arts during peacetime particularly. This 'do' is the Japanese pronunciation of Tao. All of the 'do' arts of Japan have some basis, to one degree or another, to the Jukyo and Zen influence, since they were the bringers of in/yo theory, the basis of 'do'."