I can't understand why there is so much hurt in the world. How much of it is real and how much imagined? And why are there some people who are always sad, while others are perpetually happy?

Is it just a way of seeing things that makes them this way? Simply a case of pessimism vs. optimism?

And why do still others seem happy on the surface, but when you delve deeper are full of unspoken hurts, pain, and confusion? What's the sense in it all.