Practice wishing good to other people

Forgive those who have hurt you.
If someone left a mental scar on you, forgive her.

Imagine yourself in their place.
If you can understand why they have done what they have done, you can forgive more easily. Remind yourself of it: “To understand all is to forgive all.”

Recall your feeling towards something you love.
Take something you care about deeply, a possession you cherish, a person you love, or an experience that means a lot to you. Now take that feeling, that radiating warmth that comes up when you think about it, and consider how every single person, even murderers on death row, even the jerk who just shoved you in the supermarket, has that same feeling about something in their lives. Together, you share that. Not only do you share it, but you share it with everyone who has ever lived. It connects every one of us.