When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest; and finding none, he saith, I will return unto my house whence I came out.

When a bad spirit leaves a person, it walks through empty areas looking for peace but can't find any. So, it says, "I'll go back to where I came from."

King James Version

Simple English

* Work in progress - there may be occasional inaccuracies