Note 87:3 — III
Reading edition
e. g. no combination of subject and predicate can be true because one is different from the other. 'Man' is 'man' and 'good' is 'good'; but 'man' is not 'good'. Nor can 'a horse' possibly be 'running'; they are totally different conceptions. See Plutarch, adv. Co. 22, 1 (p. 1119); Plato, Soph. 251 b; Arist. Metaph. 1024b 33; Top. 104b 20; Plato, Euthyd. 285 e. For similar reasons no statement can ever contradict another; the statements are either the same or not the same; and if not the same they do not touch. Every object has one λόγος or thing to be said about it; if you say a different λόγος you are speaking of something else. See especially Scholia Arist., p. 732a 30 ff. on the passage in the Metaphysics, 1024b 33.