Note 24 — Chapter III · * OTHER COMPANIONS OF SOKRATES.
Reading edition
The account given by Aristotle of Plato’s doctrine of Ideas, as held by Plato in his later years, appears in various passages of the Metaphysica, and in the curious account repeated by Aristoxenus (who had often heard it from Aristotle — Ἀριστοτέλης ἀεὶ διηγεῖτο) of the ἀκρόασις or lecture delivered by Plato, De Bono. See Aristoxen. Harmon. ii. p. 30, Meibom. Compare the eighth chapter in this work, — Platonic Compositions Generally. Metaphys. N. 1091, b. 13.τῶν δὲ τὰς ἀκινήτους οὐσίας εἶναι λεγόντων (sc. Platonici) οἱ μέν φασιν αὐτὸ τὸ ἓν τὸ ἀγαθὸν αὐτὸ εἶναι· οὐσίαν μέντοι τὸ ἓν αὐτοῦ ᾤοντο εἶναι μάλιστα, which words are very clearly explained by Bonitz in the note to his Commentary, p. 586: also Metaphys. 987, b. 20, and Scholia, p. 551, b. 20, p. 567, b. 34, where the work of Aristotle, Περὶ Τὰγαθοῦ, is referred to: probably the memoranda taken down by Aristotle from Plato’s lecture on that subject, accompanied by notes of his own.
In Schol. p. 573, a. 18, it is stated that the astronomer Eudoxus was a hearer both of Plato and of Eukleides.
The account given by Zeller (Phil. der Griech. ii. p. 453, 2nd ed.) of this latter phase of the Platonic doctrine of Ideas, applies exactly to that which we hear about the main doctrine of Eukleides. Zeller describes the Platonic doctrine as being “Eine Vermischung des ethischen Begriffes vom höchsten Gut, mit dem Metaphysischen des Absoluten: Der Begriff des Guten ist zunächst aus dem menschlichen Leben abstrahirt; er bezeichnet das, was dem Menschen zuträglich ist. So noch bei Sokrates. Plato verallgemeinert ihn nun zum Begriff des Absoluten; dabei spielt aber seine ursprüngliche Bedeutung noch fortwährend herein, und so entsteht die Unklarheit, dass weder der ethische noch der metaphysische Begriff des Guten rein gefasst wird.”
This remark is not less applicable to Eukleides than to Plato, both of them agreeing in the doctrine here criticised. Zeller says truly, that the attempt to identify Unum and Bonum produces perpetual confusion. The two notions are thoroughly distinct and independent. It ought not to be called (as he phrases it) “a generalization of Bonum”. There is no common property on which to found a generalization. It is a forced conjunction between two disparates.