The original contribution that this text aims to do is to reread the precepts of a samurai of 1645 in the light of psychological knowledge that provides useful concepts and indications to ensure that each person performs to the maximum of his or her potential. A goal that can also be set in contexts less bloody than that of the samurai, such as in sports, study, work... For this reason, it can be interesting for anyone to reflect on the proposed precepts and practice them in their own life.