All the books you have read have been read by other people. And all the songs you love have been heard by other people. And that girl that's pretty to you is pretty to other people. And you know if you looked at these facts when you were happy, you would feel great because they're describing unity. It's like when you're excited about a girl and you see a couple holding hands you feel so happy for them, and other times you see the same couple and they make you so mad. And all you want is to always feel happy for them because you know that if you do it means that you're happy too.