1 Ironical. Cf. Phaedrus 266 E.
2 τινὰ does not mean that the theory of Ideas is a novelty here or that the terminology is new and strange. It merely says that the type of mind that is absorbed in the concrete cannot apprehend any general aspect of things.αὐτό and κατὰ ταὐτά are the technical designation of the Idea here. Cf. my note on Philebus 64 A, Class. Phil. xx. (1925) p. 347.
3 Plato consciously uses mere logic to lend the emphasis and dignity of absolute metaphysics to his distinction between the two types of mind, which is for all practical purposes his main point here. If you cannot correctly define the beautiful, all your imperfect definitions will be refuted by showing that they sometimes describe what is ugly. Cf. Hippias Major 289 C and note on Republic i. 333 E. The many concrete objects are this and are not that, and so with conscious use of the ambiguity of the copula may be said to tumble about between being and not-being. That this is the consciously intended meaning may be inferred from the fact that in Timaeus 37 E, where Plato must have had in mind the conclusions of the Sophist, he still avails himself of this ambiguity to suggest an absolute being behind phenomena. Cf. Unity of Plato's Thought, pp. 55, 56, 60, De Platonis Idearum Doctrina pp. 48, 49.
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