Always be able to kill your students

Any place we can breathe, we can do Ninjutsu.

Those who desire only techniques will never understand this art. It is everything beyond that

Focus on the future for 50%, on the present for 40%, and on the past for 10%

You must throw away your bad habits to get good.

You must be on your toes constantly, yet be relaxed.

The first priority to the ninja is to win without fighting.