Here we have an explicit proposition about the attribution of the (accidental) form sad (indicating this attribution by equating the predicate term ' sad ' with the subject term ' Cassio ' ), which proposition is a member of the set of all possible implicit predications predicating the term ' sad ' of some possible subject term, which together constitute or develops the concept ' sad ' (to the members of this set also belongs the predication of the term ' sad ' of the (most general) subject term ' this ', but for full characterization and constitution of the concept ' sad ' all its possible subjects must enter into that characterization].