Do not regret what you have done
You can only fight the way you practice
Imitation is the surest form of flattery and failure. I am not interested with your talk about my ideas. I am more interested in your applying them to your life. If you do not, then you are essentially not in accord with your own mind.
Know your enemy, know his sword.
Think lightly of yourself and deeply of the world
When you cannot be deceived by men you will have realised the wisdom of strategy.