Top Ten Reasons To Be Happy:

10. It feels good

9. It draws down positive miracles for you

8. You make others feel good

7. As you make others feel good, they want to be your friends

6. As you have friends, you earn a reward in the world to come

5. Well, by not allowing depression to come, you prevent negative energy from entering

4. By not being depressed, your immune system is stronger

3. By being happy, you show yourself, the world and God, that your faith in goodness is stronger than your fear of evil

2. By being happy you break the limitation of Golus exile – the perception, that evil is stronger than goodness

1. By being happy (see number 2.) you bring Moshiach!