I recommend reading the sacred texts of as many religions as you can. My favorite is the Tao-te-Ching because it is entirely about acceptance, acceptance of what is and the joys of living simply.
Reading about other faiths can teach you a lot. I believe Native Americans are some of the most spiritual in their traditions because they respect life in all of its forms and the earth just as it is. Here are the Native American Ten Commandments:
1. Take responsibility for your actions. (No more "I was tempted by Satan" nonsense.)
2. Be truthful and honest at all times.
3. Dedicate a share of your efforts to the greater good. (This does not mean hawking religious literature, I'm sure.)
4. Look after the well-being of mind and body.
5. Do what you know in your heart to be right.
6. Give assistance and kindness wherever needed.
7. Work together for the benefit of all.
8. Show great respect for your fellow beings.
9. Remain close to the Great Spirit.
10. Treat the earth and all that dwell thereon with respect.