The Four Agreements book:
1. Be impeccable with your word
Speak with integrity. Say only what you mean. Avoid using your word to gossip or speak against yourself.
2. Don't take anything personally
Realize that what others say and do is a projection of their own reality, not yours. Their actions reflect them.
3. Don't make assumptions
Communicate clearly. Ask questions so you have the facts instead of guessing or jumping to conclusions.
4. Always do your best
Your best changes from moment to moment. Simply do the best you can in any given situation to avoid self-judgment and regret.