"Protect me from knowing what I don't need to know. Protect me from even knowing that I decided not to know about the things that I decided not to know about. Amen." That's it. It's what you pray silently inside yourself anyway, so you may as well have it out in the open.
The Ultimate Hitchhiker's Guide to the Galaxy, Mostly Harmless, Chapter 9 (p. 704), The Ballantine Book Company. 2002