Any place we can breathe, we can do Ninjutsu.
Nature is your friend; it helps you to win. Your enemy will have unnatural movement, therefore you will be able to know what he is going to do before he does it.
The simplest is always the most difficult.
If you do not let go of thinking about forms, you will not understand what I am showing.
Budo is simply the study of the best ways to kill.
You must throw away your bad habits to get good.