Forget your sadness, anger, grudges and hatred. Let them pass like smoke caught in a breeze. Do not indulge yourself in such feelings.
The simplest is always the most difficult.
Budo is simply the study of the best ways to kill.
You must be on your toes constantly, yet be relaxed.
You must throw away your bad habits to get good.
Learning a technique is not an end in itself, it merely indicates where you need to start.