Think of the lilies and how they grow. They don't work, and they don't spin thread for clothes, but I tell you, not even Solomon in all his glory was as beautifully dressed as one of them.
Look at the ravens. They don't sow or reap, they don't have any storerooms or barns, but God feeds them. And you're far more valuable than birds!
If you can't do anything about such small things, why worry about the rest?