Do not act following customary beliefs.

Do not waste time idling or thinking after you have set your goals

When in a fight to the death, one wants to employ all one's weapons to the utmost. I must say that to die with one's sword still sheathed is most regrettable.

To become the enemy, see yourself as the enemy of the enemy

If the enemy thinks of the mountains, attack like the sea; and if he thinks of the sea, attack like the mountains.

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.

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.