William Peter Blatty

God never talks. But the devil keeps advertising, Father. The devil does a lot of commercials.

Perhaps evil is the crucible of goodness... and perhaps even Satan - Satan, in spite of himself - somehow serves to work out the will of God.

You don't blame us for being here, do you? After all, we have no place to go. No home... Incidentally, what an excellent day for an exorcism.