Republic

But if some contradiction is always seen coincidentally with it, so that it no more appears to be one than the opposite, there would forthwith be need of something to judge between them, and it would compel the soul to be at a loss and to inquire, by arousing thought in itself, and to ask, whatever then is the one as such, and thus the study of unity will be one of the studies that guide and convert the soul to the contemplation of true being.” “But surely,” he said, “the visual perception of it[*](See crit. note and Adam ad loc.) does especially involve this. For we see the same thing at once as one and as an indefinite plurality.[*](This is the problem of the one and the many with which Plato often plays, which he exhaustively and consciously illustrates in the Parmenides, and which the introduction to the Philebus treats as a metaphysical nuisance to be disregarded in practical logic. We have not yet got rid of it, but have merely transferred it to psychology.)” “Then if this is true of the one,” I said, “the same holds of all number, does it not?” Of course. “But, further, reckoning and the science of arithmetic[*](Cf. Gorg. 450 D, 451 B-C.) are wholly concerned with number.” “They are, indeed.” “And the qualities of number appear to lead to the apprehension of truth.” “Beyond anything,” he said. “Then, as it seems, these would be among the studies that we are seeking. For a soldier must learn them in order to marshal his troops, and a philosopher, because he must rise out of the region of generation and lay hold on essence or he can never become a true reckoner.[*](Cf. my review of Jowett, A.J.P. xiii. p. 365. My view there is adopted by Adam ad loc., and Apelt translates in the same way.)” “It is so,” he said. “And our guardian is soldier and philosopher in one.” Of course. “It is befitting, then, Glaucon, that this branch of learning should be prescribed by our law and that we should induce those who are to share the highest functions of state to enter upon that study of calculation and take hold of it, not as amateurs, but to follow it up until they attain to the contemplation of the nature of number,[*](It is not true as Adam says that the nature of numbers cannot be fully seen except in their connection with the Good. Plato never says that and never really meant it, though he might possibly have affirmed it on a challenge. Numbers are typical abstractions and educate the mind for the apprehension of abstractions if studied in their nature, in themselves, and not in the concrete form of five apples. There is no common sense nor natural connection between numbers and the good, except the point made in the Timaeus 53 B, and which is not relevant here, that God used numbers and forms to make a cosmos out of a chaos.) by pure thought, not for the purpose of buying and selling,[*](Instead of remarking on Plato’s scorn for the realities of experience we should note that he is marking the distinctive quality of the mind of the Greeks in contrast with the Egyptians and orientals from whom they learned and the Romans whom they taught. Cf. 525 D καπηλεύειν, and Horace, Ars Poetica 323-332, Cic. Tusc. i. 2. 5. Per contra Xen. Mem. iv. 7, and Libby, Introduction to History of Science, p. 49: In this the writer did not aim at the mental discipline of the students, but sought to confine himself to what is easiest and most useful in calculation, such as men constantly require in cases of inheritance, legacies, partition, law-suits, and trade, and in all their dealings with one another, or where the measuring of lands, the digging of canals, geometrical computation, and other objects of various sorts and kinds are concerned.) as if they were preparing to be merchants or hucksters, but for the uses of war and for facilitating the conversion of the soul itself from the world of generation to essence and truth.” “Excellently said,” he replied. “And, further,” I said, “it occurs to me,[*](Cf. on 521 D, p. 147, note e.) now that the study of reckoning has been mentioned, that there is something fine in it, and that it is useful for our purpose in many ways, provided it is pursued for the sake of knowledge[*](Cf. Aristot. Met. 982 a 15 τοῦ εἰδέναι χάριν, and Laws 741 C. Montesquieu apud Arnold, Culture and Anarchy, p. 6: The first motive which ought to impel us to study is the desire to augment the excellence of our nature and to render an intelligent being more intelligent.) and not for huckstering.” “In what respect?” he said. “Why, in respect of the very point of which we were speaking, that it strongly directs the soul upward and compels it to discourse about pure numbers,[*](Lit. numbers (in) themselves, i.e. ideal numbers or the ideas of numbers. For this and the following as one of the sources of the silly notion that mathematical numbers are intermediate between ideal and concrete numbers, cf. my De Platonis Idearum Doctrina, p. 33, Unity of Plato’s Thought, pp. 83-84, Class. Phil. xxii. (1927) pp. 213-218.) never acquiescing if anyone proffers to it in the discussion numbers attached to visible and tangible bodies. For you are doubtless aware that experts in this study, if anyone attempts to cut up the one in argument, laugh at him and refuse to allow it; but if you mince it up,[*](Cf. Meno 79 C κατακερματίζῃς, Aristot. Met. 1041 a 19 ἀδιαίρετον πρὸς αὑτὸ ἕκαστον· τοῦτο δ’ ἦν τὸ ἑνὶ εἶναι, Met. 1052 b a ff., 15 ff. and 1053 a 1 τὴν γὰρ μονάδα τιθέασι πάντῃ ἀδιαίρετον. κερματίζειν is also the word used of breaking money into small change.) they multiply, always on guard lest the one should appear to be not one but a multiplicity of parts.[*](Numbers are the aptest illustration of the principle of the Philebus and the Parmenides that thought has to postulate unities which sensation (sense perception) and also dialectics are constantly disintegrating into pluralities. Cf. my Ideas of Good in Plato’s Republic, p. 222. Stenzel, Dialektik, p. 32, says this dismisses the problem of the one and the many das ihn (Plato) später so lebhaft beschäftigen sollte. But that is refuted by Parmen. 159 C οὐδὲ μὴν μόριά γε ἔχειν φαμὲν τὸ ὡς ἀληθῶς ἕν. The problem was always in Plato’s mind. He played with it when it suited his purpose and dismissed it when he wished to go on to something else. Cf. on 525 A, Phaedr. 266 B, Meno 12 C, Laws 964 A, Soph. 251.)” “Most true,” he replied.

“Suppose now, Glaucon, someone were to ask them, My good friends, what numbers[*](This is one of the chief sources of the fancy that numbers are intermediate entities between ideas and things. Cf. Alexander, Space, Time, and Deity, i. p. 219: Mathematical particulars are therefore not as Plato thought intermediate between sensible figures and universals. Sensible figures are only less simple mathematical ones. Cf. on 525 D. Plato here and elsewhere simply means that the educator may distinguish two kinds of numbers—five apples, and the number five as an abstract idea. Cf. Theaet. 19 E: We couldn’t err about eleven which we only think, i.e. the abstract number eleven. Cf. also Berkeley, Siris, 288.) are these you are talking about, in which the one is such as you postulate, each unity equal to every other without the slightest difference and admitting no division into parts? What do you think would be their answer?” “This, I think—that they are speaking of units which can only be conceived by thought, and which it is not possible to deal with in any other way.” “You see, then, my friend,” said I, “that this branch of study really seems to be indispensable for us, since it plainly compels the soul to employ pure thought with a view to truth itself.” “It most emphatically does.” “Again, have you ever noticed this, that natural reckoners are by nature quick in virtually all their studies? And the slow, if they are trained and drilled in this, even if no other benefit results, all improve and become quicker than they were[*](Cf. Isoc. Antid. 267 αὐτοὶ δ’ αὑτῶν εὐμαθέστεροι. For the idiom αὐτοὶ αὑτῶν cf. also 411 C. 421 D, 571 D, Prot. 350 A and D, Laws 671 B, Parmen. 141 A, Laches 182 C. Educators have actually cited him as authority for the opposite view. On the effect of Mathematical studies cf. also Laws 747 B, 809 C-D, 810 C, Isoc. Antid. 276. Cf. Max Tyr. 37 7 ἀλλὰ τοῦτο μὲν εἴη ἄν τι ἐν γεωμετρίᾳ τὸ φαυλότατον. Mill on Hamilton ii. 311 If the Practice of mathematical reasoning gives nothing else it gives wariness of mind. ibid. 312.)?” “It is so,” he said. “And, further, as I believe, studies that demand more toil in the learning and practice than this we shall not discover easily nor find many of them.[*](The translation is, I think, right. Cf. A.J.P. xiii. p. 365, and Adam ad loc.)” “You will not, in fact.” “Then, for all these reasons, we must not neglect this study, but must use it in the education of the best endowed natures.” “I agree,” he said. “Assuming this one point to be established,” I said, “let us in the second place consider whether the study that comes next[*](Cf. Burnet, Early Greek Philosophy, p. 111: Even Plato puts arithmetic before geometry in the Republic in deference to tradition. For the three branches of higher learning, arithmetic, geometry, and astronomy, Cf. Laws 811 E-818 A, Isoc. Antid. 261-267, Panath. 26, Bus. 226; Max, Tyr. 37 7.) is suited to our purpose.” “What is that? Do you mean geometry,” he said. “Precisely that,” said I. “So much of it,” he said, “as applies to the conduct of war[*](Cf. Basilicon Doron (Morley, A Miscellany, p. 144): I grant it is meete yee have some entrance, specially in the Mathematickes, for the knowledge of the art militarie, in situation of Campes, ordering of battels, making fortifications, placing of batteries, or such like.) is obviously suitable. For in dealing with encampments and the occupation of strong places and the bringing of troops into column and line and all the other formations of an army in actual battle and on the march, an officer who had studied geometry would be a very different person from what he would be if he had not.” “But still,” I said, “for such purposes a slight modicum[*](This was Xenophon’s view, Mem. vi. 7. 2. Whether it was Socrates’ nobody knows. Cf. pp. 162-163 on 525 C, Epin. 977 E, Aristoph. Clouds 202.) of geometry and calculation would suffice. What we have to consider is whether the greater and more advanced part of it tends to facilitate the apprehension of the idea of good.[*](Because it develops the power of abstract thought. Not because numbers are deduced from the idea of good. Cf. on 525, p. 162, note b.) That tendency, we affirm, is to be found in all studies that force the soul to turn its vision round to the region where dwells the most blessed part of reality,[*](Cf. 518 C. Once more we should remember that for the practical and educational application of Plato’s main thought this and all similar expressions are rhetorical surplusage or unction, which should not be pressed, nor used e.g. to identify the idea of good with god. Cf. Introd. p. xxv.) which it is imperative that it should behold.” “You are right,” he said. “Then if it compels the soul to contemplate essence, it is suitable; if genesis,[*](Or becoming. Cf. 485 B, 525 B.) it is not.” “So we affirm.[*](γε δή is frequent in confirming answers. Cf. 557 B, 517 C, Symp. 172 C, 173 E, Gorg. 449 B, etc.)”

“This at least,” said I, “will not be disputed by those who have even a slight acquaintance with geometry, that this science is in direct contradiction with the language employed in it by its adepts.[*](Geometry (and mathematics) is inevitably less abstract than dialectics. But the special purpose of the Platonic education values mathematics chiefly as a discipline in abstraction. Cf. on 523 A, p. 152, note b; and Titchener, A Beginner’s Psychology, pp. 265-266: There are probably a good many of us whose abstract idea of triangle is simply a mental picture of the little equilateral triangle that stands for the word in text-books of geometry. There have been some attempts to prove (that of Mr. F. M. Cornford in Mind, April 1932, is the most recent) that Plato, if he could not anticipate in detail the modern reduction of mathematics to logic, did postulate something like it as an ideal, the realization of which would abolish his own sharp distinction between mathematics and dialectic. The argument rests on a remote and strained interpretation of two or three texts of the Republic (cf. e.g. 511 and 533 B-D) which, naturally interpreted, merely affirm the general inferiority of the mathematical method and the intermediate position for education of mathematics as a propaedeutic to dialectics. Plato’s purpose throughout is not to exhort mathematicians as such to question their initiatory postulates, but to mark definitely the boundaries between the mathematical and other sciences and pure dialectics or philosophy. The distinction is a true and useful one today. Aristotle often refers to it with no hint that it could not be abolished by a new and different kind of mathematics. And it is uncritical to read that intention into Plato’s words. He may have contributed, and doubtless did contribute, in other ways to the improvement and precision of mathematical logic. But he had no idea of doing away with the fundamental difference that made dialectics and not mathematics the coping-stone of the higher education—science as such does not question its first principles and dialectic does. Cf. 533 B-534 E.)” “How so?” he said. “Their language is most ludicrous,[*](The very etymology of geometry implies the absurd practical conception of the science. Cf. Epin. 990 C γελοῖον ὄνομα.) though they cannot help it,[*](Cf. Polit. 302 E, Laws 757 E, 818 B, Phileb. 62 B, Tim. 69 D, and also on 494 A. The word ἀναγκαίως has been variously misunderstood and mistranslated. It simply means that geometers are compelled to use the language of sense perception though they are thinking of abstractions (ideas) of which sense images are only approximations.) for they speak as if they were doing something[*](Cf. Aristot. Met. 1051 a 22 εὑρίσκεται δὲ καὶ τὰ διαγράμματα ἐνεργείᾳ· διαιροῦντες γὰρ εὑρίσκουσιν, geometrical constructions, too, are discovered by an actualization, because it is by dividing that we discover them. (Loeb tr.)) and as if all their words were directed towards action. For all their talk[*](For φθεγγόμενοι cf. on 505 C, p. 89, note g.) is of squaring and applying[*](Cf. Thompson on Meno 87 A.) and adding and the like,[*](E. Hoffmann, Der gegenwärtige Stand der Platonforschung, p. 1091 (Anhang, Zeller, Plato, 5th ed.), misunderstands the passage when he says: Die Abneigung Platons, dem Ideellen irgendwie einen dynamischen Charakter zuzuschreiben, zeigt sich sogar in terminologischen Andeutungen; so verbietet er Republ. 527 A für die Mathematik jede Anwendung dynamischer Termini wie τετραγωνίζειν, παρατείνειν, προστιθέναι Plato does not forbid the use of such terms but merely recognizes their inadequacy to express the true nature and purpose of geometry.) whereas in fact the real object of the entire study is pure knowledge.[*](Cf. Meyerson, De l’explication dans les sciences, p. 33: En effet, Platon déjà fait ressortir que la géométrie, en dépit de l’apparence, ne poursuit aucun but pratique et n’a tout entière d’autre objet que Ia connaissance.)” “That is absolutely true,” he said. “And must we not agree on a further point?” What? “That it is the knowledge of that which always is,[*](i.e. mathematical ideas are (Platonic) ideas like other concepts. Cf. on 525 D, p. 164, note a.) and not of a something which at some time comes into being and passes away.” “That is readily admitted,” he said, “for geometry is the knowledge of the eternally existent.” “Then, my good friend, it would tend to draw the soul to truth, and would be productive of a philosophic attitude of mind, directing upward the faculties that now wrongly are turned earthward.” “Nothing is surer,” he said. “Then nothing is surer,” said I, “than that we must require that the men of your Fair City[*](καλλιπόλει: Plato smiles at his own Utopia. There were cities named Callipolis, e.g. in the Thracian Chersonese and in Calabria on the Gulf of Tarentum. Cf. also Herod. vii. 154. fanciful is the attempt of some scholars to distinguish the Callipolis as a separate section of the Republic, or to take it as the title of the Republic.) shall never neglect geometry, for even the by-products of such study are not slight.” “What are they?” said he. “What you mentioned,” said I, “its uses in war, and also we are aware that for the better reception of all studies[*](Plato briefly anticipates much modern literature on the value of the study of mathematics. Cf. on 526 B, p. 166, note a. Olympiodorus says that when geometry deigns to enter into matter she creates mechanics which is highly esteemed.) there will be an immeasurable[*](For ὅλῳ καὶ παντί cf. 469 C. Laws 779 B, 734 E, Phaedo 79 E, Crat. 434 A.) difference between the student who has been imbued with geometry and the one who has not.” “Immense indeed, by Zeus,” he said. “Shall we, then, lay this down as a second branch of study for our lads?” “Let us do so,” he said. “Shall we set down astronomy as a third, or do you dissent?” “I certainly agree,” he said; “for quickness of perception about the seasons and the courses of the months and the years is serviceable,[*](Xen. Mem. iv. 7. 3 ff. attributes to Socrates a similar utilitarian view of science.) not only to agriculture and navigation, but still more to the military art.” “I am amused,[*](For ἡδὺς εἶ cf. 337 D, Euthydem. 300 A, Gorg. 491 E ἥδιστε, Rep. 348 C γλυκὺς εἶ, Hipp. Maj. 288 B.)” said I, “at your apparent fear lest the multitude[*](Cf. on 499 D-E, p. 66, note a.) may suppose you to be recommending useless studies.[*](Again Plato anticipates much modern controversy.) It is indeed no trifling task, but very difficult to realize that there is in every soul an organ or instrument of knowledge that is purified[*](Cf. Xen. Symp. 1. 4 ἐκκεκαθαρμένοις τὰς ψυχάς, and Phaedo 67 B-C.) and kindled afresh by such studies when it has been destroyed and blinded by our ordinary pursuits, a faculty whose preservation outweighs ten thousand eyes[*](Another instance of Plato’s unction. Cf. Tim. 47 A-B, Eurip. Orest. 806 μυρίων κρείσσων, and Stallbaum ad loc. for imitations of this passage in antiquity.); for by it only is reality beheld. Those who share this faith will think your words superlatively[*](For ἀμηχάνως ὡς Cf. Charm. 155 D ἀμήχανόν τι οἷον. Cf. 588 A, Phaedo 80 C, 95 C, Laws 782 A, also Rep. 331 A θαυμάστος ὡς, Hipp. Maj. 282 C, Epin. 982 C-E, Aristoph. Birds 427, Lysist. 198, 1148.) true. But those who have and have had no inkling of it will naturally think them all moonshine.[*](This is the thought more technically expressed in the earlier work, Crito 49 D. Despite his faith in dialectics Plato recognizes that the primary assumptions on which argument necessarily proceeds are irreducible choices of personality. Cf. What Plato Said, p. 478, Class. Phil. ix. (1914) p. 352.) For they can see no other benefit from such pursuits worth mentioning.