Know your enemy, know his sword.

Do not think dishonestly... Distinguish between gain and loss in worldly matters. Develop intuitive judgement and understanding for everything. Perceive those things which cannot be seen. Pay attention even to trifles. Do nothing which is of no use.

Even if a man has no natural ability, he can be a warrior.

When you have attained the way of strategy there will be nothing that you cannot understand. You will see the way in everything.

from one thing, know ten thousand things

When your opponent is hurrying recklessly, you must act contrarily and keep calm. You must not be influenced by the opponent.

As if with the nut and flower, the nut has become less than the flower... both those teaching and those learning are concerned with colouring and showing off their technique, trying to hasten the bloom of the flower.