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].

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

When weak or injured always continue training as you should always be able to adapt in any condition.

The simplest is always the most difficult.

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

Move with your feet, the hands will follow.

You must throw away your bad habits to get good.