Plato could not have defended this small list of Pleasures, upon his own admission, against his opponents — the Pleasure-haters, who disallowed pleasures altogether.
The catalogue of pleasures recognised by Plato being so narrow (and much of them attainable only by a few persons), the amount of difference is really very small between him and his pleasure-hating opponents, who disallowed pleasure altogether. But small as the catalogue is, he could not consistently have defended it against them, upon his own principles. His opponents could have shown him that a considerable portion of it must be discarded, if we are to disallow all pleasures which are preceded by or intermingled with pain — or which are sometimes stronger, sometimes feebler, according to the relations of contrast or similarity with other concomitant sensations. Mathematical study certainly, far from being all pleasure and no pain, demands an irksome preparatory training (which is numbered among the miseries of life in the Axiochus[136]), succeeded by long laborious application, together with a fair share of vexatious puzzle and disappointment. The love of knowledge grows up by association (like the thirst for money or power), and includes an uncomfortable consciousness of ignorance: nay, it is precisely this painful consciousness which the Sokratic method was expressly intended to plant forcibly in the student’s mind, as an indispensable antecedent condition. Requital doubtless comes in time; but the outlay is not the less real, and is quite sufficient to disentitle the study from being counted as a true pleasure, in the Platonic sense. Nor could Plato, upon his own principles, defend the pleasures of sight, sound, and smell. For though he might justly contend that there were some objects originally agreeable to these senses, yet all these objects will appear more or less agreeable, according to the accompanying contrasts under which they are presented, while, in particular states of the organ, they will not appear agreeable at all. Now such variability of estimate is among the grounds alleged by Plato for declaring pleasures to be false.[137]
[136] See the pseudo-Platonic dialogue Axiochus, pp. 366-367. Compare Republic, vii. 526 C, vi. 504 C.
The Sokratic method, in creating consciousness of ignorance, is exhibited not less in the Xenophontic Memorabilia (iv. 2, 40) than in various Platonic dialogues, Alkibiades I., Theætêtus, &c. We read it formally proclaimed by Sokrates in the Platonic Apology.
Aristotle repeats the assertion contained in the Philêbus about the list of painless pleasures — ἄλυποι γάρ εἰσιν αἵ τε μαθηματικαὶ, &c. (Ethic. Nikom. x. 2, 1173, b. 16; 7, 1177, a. 25.) He himself says in another place (vii. 13, 1153, a. 20) that τὸ θεωρεῖν sometimes hurts the health, and if he had examined the lives of mathematicians, especially that of Kepler, he would hardly have imagined that mathematical investigations have no pains attached to them. He probably means that they are not preceded by painful appetites such as hunger and thirst. But they are preceded by acquired impulses or desires, which in reference to the present question are upon same footing as the natural appetites. A healthy and temperate man, leading a regular life and in easy circumstances, knows little of hunger and thirst as pains: he knows them only as appetites which give relish to his periodical meals. It is only when this periodical satisfaction is withheld that his appetite grows to a painful and distressing height. So too the φιλομαθής; his appetite for study, when regularly gratified to an extent consistent with health and other considerations, is not painful; but it will rise to the height of a most distressing privation if he be debarred from gratifying it, excluded from books and papers, disturbed by noises and intrusions. Kepler, if interdicted from pursuing his calculations, would have been miserable. Jason of Pheræ was heard to say that he felt hungry so long as he was not in possession of supreme power — πεινῇν, ὅτε μὴ τυραννοῖ, Aristot. Politic. iii. 4, 1277, a. 24; thus intimating that the acquired appetite of ambition had in his mind reached the same intensity as the natural appetite of hunger.
[137] Plato, Philêbus, pp. 41-42. In the Phædon (p. 60 B) Sokrates makes a striking remark on the inseparable conjunction of pleasure with pain generally.
Sokrates in this dialogue differs little from these Pleasure-haters.
How little the Sokrates of this dialogue differs, at the bottom, from the fastidious pleasure-haters, may be seen by the passage in which he proclaims that the life of intelligence alone, without the smallest intermixture of pleasure or pain, is the really perfect life: that the Gods and the divine Kosmos have no enjoyment and no suffering.[138] The emotional department of human nature is here regarded as a degenerate and obstructive appendage: so that it was an inauspicious act of the sons of the Demiurgus (in the Timæus[139]) when they attached the spherical head (the miniature parallel of the Kosmos, with the rotatory movements of the immortal soul in the brain within) at the summit of a bodily trunk and limbs, containing the thoracic and abdominal cavities: the thoracic cavity embodying a second and inferior soul with the energetic emotions and passions — the abdominal region serving as lodgment to a third yet baser soul with the appetites. From this conjunction sprang the corrupting influence of emotional impulse, depriving man of his close parallelism with the Kosmos, and poisoning the life of pure exclusive Intelligence — regular, unfeeling, undisturbed. The Pleasure-haters, together with Speusippus and others, declared that pleasure and pain were both alike enemies to be repelled, and that neutrality was the condition to be aimed at.[140] And such appears to me to be the drift of Plato’s reasonings in the Philêbus: though he relaxes somewhat the severity of his requirements in favour of a few pleasures, towards which he feels the same indulgence as towards Homer in the Republic.[141] When Ethics are discussed, not upon principles of their own (οἰκεῖαι ἀρχαὶ), but upon principles of Kosmology or Ontology, no emotion of any kind can find consistent place.
[138] Plato, Philêbus, p. 33 B.
[139] Plato, Timæus, pp. 43 A, 44 D, 69 D, 70-71. The same fundamental idea though embodied in a different illustration, appears also in the Phædon; where Sokrates depicts life as a period of imprisonment, to which the immortal rational soul is condemned, in a corrupt and defective body, with perpetual stream of disturbing sensations and emotions (Phædon, pp. 64-65).