Dried up bones. We know that there used to be something with those bones, but now that something is dead. Can dried up bones come back to life? Of course not, unless God speaks a Word and then they can not only arise but they can become a real person with life again.  God is able to do that which is impossible for man.  He can speak life into a person's life when it seems that it is hopeless. He can speak life into a person who is spiritually dead.  Trust God with the impossible.