You can complain because roses have thorns, or you can rejoice because thorns have roses.- Ziggy

This quote means you should think of the positive things in life and not be a Debby Downer. Just think of a half a cup of milk. You shouldn't complain about it being half empty you should be happy that its half full. Just because you don't like something doesn't mean you can't change the way you think about it.(: