As soon as you concern yourself with the 'good' and 'bad' of your fellows, you create an opening in your heart for maliciousness to enter. Testing, competing with, and criticizing others weakens and defeats you.

Always imagine yourself on the battlefield under the fiercest attack; never forget this crucial element of training. (p. 36)

Be grateful even for hardship, setbacks, and bad people. Dealing with such obstacles is an essential part of training in the Art of Peace.

Regarding technique, from ancient times it has been said that movements must fly like lightning and attacks must strike like thunder. (p. 33)