God has two fires!

(Thomas Watson, "The Beatitudes" 1660)

God has two fires:
  one where He puts His gold,
  one where He puts His dross.

The fire where He puts His gold, is the fire of affliction — to purify them.
"I have refined you in the furnace of affliction." Isaiah 48:10

The fire where He puts His dross, is the fire of damnation — to punish them.
"Away with you, you cursed ones, into the eternal fire prepared for the Devil and his demons!
 And they will go away into eternal punishment!" Matthew 25:41, 46