 (vi) The fact that an operatio is distinctive of human beings does not entail that that operatio is truly valuable, still less that it is obligatory, or that it is more valuable than alternative and incompatible ways or objectives of acting. For a premise containing no evaluative or normative term cannot entail a conclusion including such a term. If, on the other hand, the postulate that a certain operatio is the proper (or even a proper) function of human beings is asserted to be itself evaluative and/or normative rather than, or as well as, factual/descriptive, then some account is needed of the postulate’s source or justification (or self-evidence?). Aquinas has a fairly careful account of the self-evidence of a number of foundational evaluative and normative principles, but only one or two of them are said by him to point to kinds of operatio distinctive of human beings; two of the foundational principles are explicitly said by him to direct to goods that are not peculiar to human beings.