It is hard to think that way sometimes.
Today notice all the things that work in your favor. If you have a job, remember that this is one day closer to where you want to be. If yesterday was bad, know that today will be better.
It is easier to keep a positive frame of mind when things go well. It is tougher to do so when in the midst of problems, difficulties or obstacles. In such times you will need more effort, attention and patience.