In Koyo Gunkan (1616), Bushido is a survival technique for individual fighters, and it aims to make the development of the self and the clan troupe advantageous by raising the samurai name. He also affirms that he seeks a lord who praises himself for wandering, as reflected in Tōdō Takatora (1556–1630)'s deceased memoir that ""A samurai cannot be called a samurai until he has changed his lords seven times." Also, as symbolized by Asakura Norikage (1477–1555), "The warrior may be called a beast or a dog; the main thing is winning." as symbolized by Asakura Norikage, it is essential to win the battle even with the slander of cowardice. The feature is that it also contains the cold-hearted philosophy. These are mainly related to the way of life as a samurai, and they are the teachings of each family, and they are also equivalent to the treatment of vassals.