The Four Agreements - By Don Miguel Ruiz

BE IMPECCABLE WITH YOUR WORD.
Speak with integrity. Say only what you mean. Avoid using the word
to speak against yourself or to gossip about others. Use the power of
your word in the directions of truth and love.

DON'T TAKE ANYTHING PERSONALLY.
Nothing others do is because of you. What others say and do is a
projection of their own reality, their own dream. When you are immune
to the opinions and actions of others, you won't be the victim of
needless suffering.

DON'T MAKE ASSUMPTIONS.
Find the courage to ask questions and to express what you really want.
Communicate with others as clearly as you can to avoid
misunderstandings, sadness, and drama. With just this one agreement,
you can completely transform your life.

ALWAYS DO YOUR BEST.
Your best is going to change from moment to moment; it will be
different when you are healthy as opposed to sick. Under any
circumstance, simply do you best, and you will avoid self-judgment,
self-abuse, and regret.