It's impossible to feel sad or have any negative feeling when you're grateful. If you're in the midst of a difficult situation, look for something to be grateful for.
Love is... a positive force of life.
We are the creators of our universe.
Start thinking happy thoughts and start being happy.
You have to talk about what you love, to bring what you love to you.
You can change your emotion immediately .. by thinking of something joyful, or singing a song, or remembering a happy experience.