Bring forth therefore fruits worthy of repentance, and don't begin to say among yourselves, 'We have Abraham for our father;' for I tell you that God is able to raise up children to Abraham from these stones!

 John had lived in the desert. The face of the desert was covered with stubble and brushwood, as dry as tinder. Sometimes a spark set the face of the desert alight and out from their crannies came the vipers, scurrying in terror from the menacing flames. It was to them John likened the people who came to be baptized. 