God repeats a miracle he had performed when the people were following Moses by stopping the flow of a river in order for the people to cross. This allows the people to enter the land that had been promised to them by God.
It is sometimes easy to feel God is no longer at work. Is he still able to do the miracles we read about in the Bible? Is he still able to raise up leaders like Moses? God is always able to do what he has promised. For us, he has not promised a land, but he has promised to build his church. He will do whatever it takes to keep that promise.