Sometimes you don't know what for you smile, what for you be grateful to the God, or perhaps you want to do that but your heart or your life is not good (in your opinion).
hey dude! BE GRATEFUL doesn't need it!
One thing you must to know. There is always, always. There is always a bless (even if just a little things) if you want or you can said "thank you Lord" from the deepest heart. In everything of your life. Bad or good of your life:)