[72] Plato, Alkib. ii. p. 149-150; Xen. Mem. i. 3. Compare Plato, Legg. x. p. 885; Isokrat. ad Nikok.
[73] Plato, Alkib. ii. p. 149 E, 150 B.
Remarkable doctrine of Alkibiadês II. — that knowledge is not always Good. The knowledge of Good itself is indispensable: without that, the knowledge of other things is more hurtful than beneficial.
But we find also in Alkibiadês II. another doctrine, more remarkable. Sokrates will not proclaim absolutely that knowledge is good, and that ignorance is evil. In some cases, he contends, ignorance is good; and he discriminates which the cases are. That which we are principally interested in knowing, is Good, or The Best — The Profitable:[74] phrases used as equivalent. The knowledge of this is good, and the ignorance of it mischievous, under all supposable circumstances. And if a man knows good, the more he knows of everything else, the better; since he will sure to make a good use of his knowledge. But if he does not know good, the knowledge of other things will be hurtful rather than beneficial to him. To be skilful in particular arts and accomplishments, under the capital mental deficiency supposed, will render him an instrument of evil and not of good. The more he knows — and the more he believes himself to know — the more forward will he be in acting, and therefore the greater amount of harm will he do. It is better that he should act as little as possible. Such a man is not fit to direct his own conduct, like a freeman: he must be directed and controlled by others, like a slave. The greater number of mankind are fools of this description — ignorant of good: the wise men who know good, and are fit to direct, are very few. The wise man alone, knowing good, follows reason: the rest trust to opinion, without reason.[75] He alone is competent to direct both his own conduct and that of the society.
[74] Plato, Alkib. ii. p. 145 C. Ὅστις ἄρα τι τῶν τοιούτων οἶδεν, ἐὰν μὲν παρέπηται αὐτῷ ἡ τοῦ βελτίστου ἐπιστήμη — αὐτὴ δ’ ἦν ἡ αὐτὴ δήπου ἡπερ καὶ ἡ τοῦ ὠφελίμου — also 146 B.
[75] Plato, Alkib. ii. p. 146 A-D. ἄνευ νοῦ δόξῃ πεπιστευκότας.
The stress which is laid here upon the knowledge of good, as distinguished from all other varieties of knowledge — the identification of the good with the profitable, and of the knowledge of good with reason (νοῦς), while other varieties of knowledge are ranked with opinion (δόξα) — these are points which, under one phraseology or another, pervade many of the Platonic dialogues. The old phrase of Herakleitus — Πολυμαθίη νόον οὐ διδάσκει — “much learning does not teach reason” — seems to have been present to the mind of Plato in composing this dialogue. The man of much learning and art, without the knowledge of good, and surrendering himself to the guidance of one or other among his accomplishments, is like a vessel tossed about at sea without a pilot.[76]
[76] Plato, Alkib. ii. p. 147 A. ὁ δὲ δὴ τὴν καλουμένην πολυμάθειάν τε καὶ πολυτεχνίαν κεκτημένος, ὀρφανὸς δὲ ὢν ταύτης τῆς ἐπιστήμης, ἀγόμενος δὲ ὑπὸ μιᾶς ἑκάστης τῶν ἄλλων, &c.
Knowledge of Good — appears postulated and divined, in many of the Platonic dialogues, under different titles.
What Plato here calls the knowledge of Good, or Reason — the just discrimination and comparative appreciation of Ends and Means — appears in the Politikus and Euthydêmus, under the title of the Regal or Political Art, of employing or directing[77] the results of all other arts, which are considered as subordinate: in the Protagoras, under the title of art of calculation or mensuration: in the Philêbus, as measure and proportion: in the Phædrus (in regard to rhetoric) as the art of turning to account, for the main purpose of persuasion, all the special processes, stratagems, decorations, &c., imparted by professional masters. In the Republic, it is personified in the few venerable Elders who constitute the Reason of the society, and whose directions all the rest (Guardians and Producers) are bound implicitly to follow: the virtue of the subordinates consisting in this implicit obedience. In the Leges, it is defined as the complete subjection in the mind, of pleasures and pains to right Reason,[78] without which, no special aptitudes are worth having. In the Xenophontic Memorabilia, it stands as a Sokratic authority under the title of Sophrosynê or Temperance:[79] and the Profitable is declared identical with the Good, as the directing and limiting principle for all human pursuits and proceedings.[80]