from one thing, know ten thousand things

True warriors are fierce because their training is fierce.

Do not let your spirit be influenced by your body, or your body be influenced by your spirit. Be neither insufficiently spirited or over spirited. An elevated spirit is weak and a low spirit is weak. Do not let the enemy see your spirit.

Respect the gods and buddhas, but never rely on them.

The only reason a warrior is alive is to fight, and the only reason a warrior fights is to win

The true science of martial arts means practicing them in such a way that they will be useful at any time, and to teach them in such a way that they will be useful in all things.

Develop intuitive judgement and understanding for everything.