Had the format allowed it, a possible, albeit very long, subtitle to this paper could have been: "There are more things in the world of fuzzy logic (with respect to the possibility of picking up relevant aspects of reasoning) than in formalized mathematical logics." The previous sentence does not fit well with the role of a subtitle, but can perhaps play a role for clarifying the aims of the present paper. First of all, let us stress that we are using the term reasoning to discuss the informal (but rigorous) use of the term. What could be the content and the scope, for instance, of an invitation—when facing a difficult problem—of this kind: let us discuss about it (equivalent of let us reason about it).