This is one of the best known bits of prophecy. It is also one of the favorites of clergy, I suspect because it is so easy to visualize.
The prophet Ezekiel is put down in a valley of bones. We are told several times that the bones are dry. The point is clear. These are the remains of those who have died. There is no life here.
God puts the bones together and breathes life into them. Lest you miss the point: God is the giver of life. God can bring life even in the midst of death; God can bring the dead to life and can bring life to places where there seems to be no life. God is in control.