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

Learning a technique is not an end in itself, it merely indicates where you need to start.

Budo is simply the study of the best ways to kill.

The simplest is always the most difficult.

It's important to make an effort under any circumstance - stagnant, sickness, being in an unstable lifestyle, even when society is insane. You should consider such periods as an omen before you move. When you are stuck on something, it is important to hold to your purpose but not press onward against the current. When you can't move at all, try to concentrate, continuing forward as if in a boat switching to a stronger motor. The keiko that is most important when you cannot move is kage no keiko [shadow training].

What I want you to do is just take it as it is. Don't think too much. If you get involved with thinking about it, the whole thing gets lost or loses its purity. Don't think during practice - DO! The more you think, the further from the truth of budo you get: Budo is NOT an academic subject!

Always be able to kill your students