There was a famous Zen master whom people would seek out to become enlightened. He was strict and would occupy people with things having nothing to do with seeking enlightenment. You see, that is the only way to achieve enlightenment; by not focusing on achieving it. Then, one day it will just come to you.

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

Always be able to kill your students

If you do not let go of thinking about forms, you will not understand what I am showing.

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].

No more talk. I'm sick of people talking. Train.

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