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.
If you do not control the enemy, the enemy will control you
You can only fight the way you practice
from one thing, know ten thousand things
All things entail rising and falling timing. You must be able to discern this.
Cutting down the enemy is the way of strategy, and there is no need for many refinements of it.