Saying
Great ninjas have many lessons as a wise remark to make use of what I was able to learn by experience in the future life.
Level development is planned quickly among the schools, and many lessons to be born stay in nature and the history in this way.
I tend it to be expressed at of abstraction and a philosophy cut end so that any kind of lesson is made use of flexibly in various scenes.
Therefore the times change, and environment is the strange present age, but a wise remark to have the history is utilized effectively.
