Or possible truths of the universe?
I especially like:
"Beware of bugs in the above code; I have only proved it correct, not tried it.
-- Donald Knuth"
Which pretty much sums up my modding efforts.
Though I think this one is more appropriate for our modern times, and the Nexus in general:
"I have a spelling checker,
It came with my PC;
It plainly marks four my revue
Mistakes I cannot sea.
I've run this poem threw it,
I'm sure your pleased too no,
Its letter perfect in it's weigh,
My checker tolled me sew.
-- Janet Minor"