Acts 17:22-23

So Paul took his stand in the open space at the Areopagus and laid it out for them. “It is plain to see that you Athenians take your religion seriously. When I arrived here the other day, I was fascinated with all the shrines I came across. And then I found one inscribed, TO THE GOD NOBODY KNOWS. I’m here to introduce you to this God so you can worship intelligently, know who you’re dealing with.