behind the feelings

Have you ever had the feeling you're on top of the world, but you're really not sure why? I've realized that this is one of the best feelings ever. All I do is smile and everything seems wonderful, though nothing special happened to make me this way it just accumulated. People tend to think that there has to be something behind everyone's feeling and I say why? Why can't we just be randomly happy because we feel like it? I think it's very acceptable :) I think mainly if someone is extremely sad then there is a great possibility that something did happen that made that person that way...but I guess I don't have to worry about that cuz well, I'm on top of the world for no reason at all and I love it. God is good!