I'm not recommending that you think positive thoughts. It's more about experiencing more emotions and feelings that make you feel more connected with the world.
Deepak ChopraLove is considered the most basic emotion that human awareness can feel; therefore, it is the closest to the source of life. The burst of well-being you feel when you fall in love is due to the fact that you unconsciously open the channels of awareness that allow more Prana [Life Force] to flow.
Deepak Chopra