I can't fit all 12 in, but here are the first 7.
1. Stand up straight with your shoulders back.
2. Treat yourself like someone you are responsible for helping.
3. Make friends with people who want the best for you.
4. Compare yourself to who you were yesterday, not to who someone else is today.
5. Do not let your children do anything that makes you dislike them.
6. Set your house in perfect order before you criticize the world.
7. Pursue what is meaningful (not what is expedient).