§ 1. The Concept, its Object, its Properties
13. The Concept from the Logical Point of View. -- From the logical point of view (4) the concept is an element of judgment: it is adapted to the rôle of subject or of predicate in a proposition, notio subjicibilis vel praedicabilis in enuntiatione. In fact, judgment is the central act of the understanding: the apprehension prepares the elements of the judgment, as reasoning forms a new judgment by means of judgments already known.
By logical concepts, then, we mean the object conceived which is enunciated of another and that of which it is enunciated. The connection of these two concepts, the copula, is made with the verb to be.
The two concepts, the subject (id quod est subjectum attributioni vel praedicationi) and the predicate or attribute (id quod praedicatur vel attribuitur) are called the terms (termini) of the proposition; they are in fact its extreme points or limits.