He does the things that others cannot do. God specializes in things thought impossible. We can figure that out pretty well by ourselves. We all know what faith is. But we have a very hard time saying what faith is.
Faith defies our definitions.
We just can't quite put it into words. We know what it is and we know that we know what it is, but we find it hard to tell someone else what it is. It's far easier to say what it isn't. Perhaps that's the best way to define faith. Some things come close to being faith, but fall short.