If you are ever feeling sad or dejected, there is a faster and better way to create a more positive feeling that to simply wait until the feelings change through happenstance. There are a few basic choices with a multitude of variations. You can take positive actions. Perform a mitzvah and experience joy for the good deed you are doing. Also, you can remember the good in your life and the positive things that have happened to you in the past. If need be, you can find a positive lens through which to see your present distress.