The nature of madness is also at the same time its useful wisdom; its raison d' tre is to approach reason so closely, and be consubstantial with it so that the two form an indissoluble text, where all that can be discerned are nature's ends: the madness of love is necessary for the preservation of the species, the delirium of ambition is required for the good order of political bodies, and insane greed is necessary for wealth to be created.