 The structure of sense generates a number of paradoxes, which Deleuze distinguishes from the paradoxes of signification discovered by Russell in set theory (the set of all sets, and the “barber of the regiment”). The first is the paradox of regress, or indefinite proliferation: I can never state the sense of what I am saying, but I can take the sense of what I am saying as the object of another proposition, whose sense in turn I cannot state, ad infinitum. This first paradox points both to the impotence of the speaker (my inability to state the sense of what I am saying) and to the highest power of language (its infinite capability to speak about words). The second paradox is that of sterile reiteration or doubling: one can avoid the infinite regress by extracting sense as the mere double of a proposition, but at the price of catapulting us into a third paradox of neutrality or sterility—sense is necessarily neutral with regard to the various modes of the proposition: quality (affirmation, negation), quantity (all, some, none), relation, and modality (possibility, reality, necessity).