A famous example is a passage in the Hagakure ""Bushido is realised in the presence of death. In the case of having to choose between life and death you should choose death. There is no other reasoning. Move on with determination." It can be difficult to interpret, but it was radical at the time. That appeared in the Taihei era of the Edo period. The oral tradition of the Saga Domain feudal lord Nabeshima Mitsushige, Yamamoto Tsunetomo, is the main subject. There are many expressions that criticize the samurai who are associated with Confucianism and Buddhism that were popular at the time. There are many works that guide the art of treatment while describing the spirit of the samurai of the Sengoku period.