Forgiveness is a scalpel that removes emotional scars.
If you wait until circumstances justify your thinking pleasant thoughts, you are likely to wait forever.
You will act like the sort of person you conceive yourself to be.
Get yourself a goal worth working for. Better still, get yourself a project.
Take the trouble to stop and think of the other person's feelings, his viewpoints, his desires and needs. Think more of what the other fellow wants, and how he must feel.
Your most important sale in life is to sell yourself to yourself.