Three Things, Yea Four

The leech has two daughters, Crying, "Give! Give!" 

There are three things that are never satified, 
Four things never say, "It is enough": 
The grave, 
The barren womb, 
The earth that is not satisfied with water, 
And the fire that never says, "It is enough". 

 Proverbs 30: 15-16