Don't wait for the moment when someone you don't like is weak to let them have it. This may bring immediate satisfaction, but in the long run, it poisons you.
Don't malign others.
You speak badly of others thinking it will make you feel superior. This only sows seeds of meanness in your heart, causing others not to trust you and causing you to suffer.
Don't wallow in self-pity.
Catch yourself when you do this and recognize that it just increases your suffering (and that of others).
Don't be jealous.
Work with jealousy when it's small, otherwise when it hits full force, you'll be swept away.
Don't ponder others.
Don't ponder others' weak points, becoming arrogant about your own accomplishments.
Don't expect applause.
Don't count on receiving credit for your good deeds. Just do them anyway!
Don't be frivolous.
Don't waste your precious time. You never know how long you have.
- Always Maintain a Joyful Mind & Other Lojong Teachings on Awakening Compassion & Fearlessness (Pema Chodron)