In his writing, he contends that the study of karate helped him to act always in a controlled and rational manner. It is rumored that some individuals teaching martial arts claim to have a level of skill and training far above their actual level and who may also, for a price, confer an equally high ranking status on their students. This false status is obviously of little value. The only way to achieve a high level of skill is through diligent and determined practice. The study of karate is a tool toward one's ultimate goal- mastery of the self.
Good manners is always a good idea.
In a difficult situation, courtesy may defuse a potentially violent and dangerous situation. This does not mean that one should refrain from violence if it is needed to protect oneself or others. It does mean that violence should be avoided if possible. It is thought that by harming others, even when justified, will also do great harm to oneself.