Get beyond love and grief: exist for the good of Man.
Perceive that which cannot be seen with the eye.
Consider yourself lightly; consider the world deeply.
Also by training you will be able to freely control your own body, conquer men with your body, and with sufficient training you will be able to beat ten men with your spirit. When you have reached this point, will it not mean that you are invincible?
Accept everything just the way it is.
If you want to learn the craft of war, ponder over this book. The teacher is as a needle, the disciple is as thread. You must practice constantly.