A story by Jorge Luis Borges which you should probably read. If you can find Labyrinths, it's got better translations than the recent omnibus. Or so sez I anyhow. YMMV. I should describe it, but any attempt to describe it would spoil it.

It's brief. Read it here (but do try to ignore the unspeakably loathsome illustration):


See also Quizro's writeup in The Everything Credibility Problem, where he mentions that if Everything is really everything, it should include lies and half-truths as well . . .