Note 143 — Chapter XXXVII · REPUBLIC — REMARKS ON THE PLATONIC COMMONWEALTH. (continued 2)
Reading edition
Aristotel. Metaphys. A. p. 991, a. 22. Τί γάρ ἐστι τὸ ἐργαζόμενον, πρὸς τὰς ἰδέας ἀποβλέπον;
We find Aristotle arguing, in the course of his remarks on the Platonic Republic, that it is useless now to promulgate any such novelties; a long time has elapsed, and such things would already have been found established if they had been good (Politic. ii. 5, p. 1264, a. 2). This would have applied (somewhat less in degree, yet with quite sufficient force) to the ideal commonwealth of Aristotle himself, as well as to that of Plato.
Because such institutions have never yet been established anywhere as those proposed by Plato or Aristotle, you cannot fairly argue that they would not be good, or that they would not stand if established. What you may fairly argue is, that they are not at all likely to be established; no originating force will be forthcoming adequate to the first creation of them. Existing societies have fixed modes of thinking and feeling on social and political matters; each moves in its own groove, and the direction in which it will henceforward move will be a consequence and continuance of the direction in which it is already moving, by virtue of powerful causes now in operation. New originating force is a very rare phenomenon. Overwhelming enemies or physical calamities may destroy what exists, but they will not produce any such innovations as those under discussion.