Fool - Devil
Assume the worst.
Assume - Fool
the worst. - Devil
Fool's being the zero of the deck brings it a mind boggling number of different meanings, applications, and interpretation. Since Fool is newborn (the beginning, 0) his mind has no contents with which to think. His mind is blank, so he can only assume.
Devil in the Rider Waite deck is the medieval one with the horns and tail, etc., so Devil is the worst version of whatever it shows up to represent.
So Fool and Devil say "Assume the ...
