The Riddle of Epicurus

"God either wants to eliminate bad things and can not, or can but does not want to, or neither wishes to nor can, or both wants to and can.
If he wants to and can not, than he is weak - and this does not apply to god. If he can but does not want to, than he is spiteful - which is equally foreign to god's nature. If he neither wants to nor can, he is both weak and spiteful, and so not a god. If he wants to and can, which is the only thing fitting for a god, where then do bad things come from? Or why does he not eliminate them?"

- Lactantius: De Ira Deorum