your translation sounds good! (but i'm not very good in English, eh?)
and i think the sentence means, more or less, that rich are so dumm (silly, stupid ?) that without money (the money God gives them, but they don't earn, and they wouldn't know how to earn it) they wouldn't know how to earn a pound, and they would starve... ...they are useless to the society, they can't offer nothing interesting to the others, but the money they have... they can't make shoes, clothes, work on the fields...
do you understand what i try to mean?
Saludos!