I really like what you said: 'Your smile is someone's reason to smile. Your life is the reason someone is existing. What happens to that person when you give up?'
It is very inspiring and you're completely right! A good day isn't only good for you, but a smile in your face can change a another persons life! Just imagine everyone would walk around mad or sad and all you see when you step outside is desperate people - after days of seing them I'm pretty sure that you start having the same facial expression and you're starting to be in the same mood as everyone else! But that's when you have to be strong for everyone and go out there and show everybody how much better life is with a smile on your face! :)