1. Avoid making suffer other beings.
2. Avoid to make suffer yourself.
3. Vengeance is not justice.
4. Improve things preexisting.
5. Don’t change too much things preexisting.
6. You are always alone.
7. You can cooperate with others.
8. You can not wholly understand others.
9. Others will never understand you completely.
10. There are no rules without exception.

Via @yona_friedman