http//www.robinsharma.com/blog/12/60-tips-for-a-stunningly-great-life/
"Make a plan for attaining goals that you believe will make you happy. Your mood will very likely increase as your pursue your goal because you will feel better about yourself for going after something you value."
Surround yourself with happy people. It is easy to begin to think negatively when you are surrounded by people who think that way. Conversely, if you are around people who are happy their emotional state will be infectious.