Polite Courtesy
A samurai is not only respected for his strength in battle, but also by his dealing with other men.
The true strength of a samurai becomes apparent during difficult times.
What I get from this quote is that your development as a martial artist (i.e. warrior) affects not only your life as a martial artist, but your life in general. My life as a teacher, friend, family member, etc. has been greatly influenced by karate. My parents have thanked my Sensei several times over the years for contributing to my respect for all people, thoughtfulness, etc.
The compliments that I value the most as a Sensei are when parents and teachers of students contact me and tell me how respectful, thoughtful, and sensitive the karate-ka has become since beginning their training.