"The theologians cleverly argue that a truth that is "above reason"
can't be proven false. Very clever, but not very rational. Such
reasoning opens the door to believing that nothing is as it appears to
be, that anything that seems to be contradictory may actually be
possible. If three can equal one in a single special case, then for all
we know, two can equal six and eight can equal four in some other
special cases. In some worlds, perhaps a six-sided die has eight sides.
Can you prove that such a world does not exist? The world is already
full of things that appear to be what they're not (like lots of clever
people who appear to be rational). Why add another layer to this problem
just to defend an article of faith?"
A great look at irrationality.
http://skepdic.com/essays/anythinggoes.html