ΤΙ. πλείων δʼ ἐπιρρέουσα, τῇ παρʼ αὐτῆς θερμότητι κρατήσασα τὰς ἶνας εἰς ἀταξίαν ζέσασα διέσεισεν· καὶ ἐὰν μὲν ἱκανὴ διὰ τέλους κρατῆσαι γένηται, πρὸς τὸ τοῦ μυελοῦ διαπεράσασα γένος κάουσα ἔλυσεν τὰ τῆς ψυχῆς αὐτόθεν οἷον νεὼς πείσματα μεθῆκέν τε ἐλευθέραν, ὅταν δʼ ἐλάττων ᾖ τό τε σῶμα ἀντίσχῃ τηκόμενον, αὐτὴ κρατηθεῖσα ἢ κατὰ πᾶν τὸ σῶμα ἐξέπεσεν, ἢ διὰ τῶν φλεβῶν εἰς τὴν κάτω συνωσθεῖσα ἢ τὴν ἄνω κοιλίαν, οἷον φυγὰς ἐκ πόλεως στασιασάσης ἐκ τοῦ σώματος ἐκπίπτουσα, διαρροίας καὶ δυσεντερίας καὶ τὰ τοιαῦτα νοσήματα πάντα παρέσχετο. τὸ μὲν οὖν ἐκ πυρὸς ὑπερβολῆς μάλιστα νοσῆσαν σῶμα συνεχῆ καύματα καὶ πυρετοὺς ἀπεργάζεται, τὸ δʼ ἐξ ἀέρος ἀμφημερινούς, τριταίους δʼ ὕδατος διὰ τὸ νωθέστερον ἀέρος καὶ πυρὸς αὐτὸ εἶναι· τὸ δὲ γῆς, τετάρτως ὂν νωθέστατον τούτων, ἐν τετραπλασίαις περιόδοις χρόνου καθαιρόμενον, τεταρταίους πυρετοὺς ποιῆσαν ἀπαλλάττεται μόλις. καὶ τὰ μὲν περὶ τὸ σῶμα νοσήματα ταύτῃ συμβαίνει γιγνόμενα, τὰ δὲ περὶ ψυχὴν διὰ σώματος ἕξιν τῇδε. νόσον μὲν δὴ ψυχῆς ἄνοιαν συγχωρητέον, δύο δʼ ἀνοίας γένη, τὸ μὲν μανίαν, τὸ δὲ ἀμαθίαν. πᾶν οὖν ὅτι πάσχων τις πάθος ὁπότερον αὐτῶν ἴσχει, νόσον προσρητέον, ἡδονὰς δὲ καὶ λύπας ὑπερβαλλούσας τῶν νόσων μεγίστας θετέον τῇ ψυχῇ· περιχαρὴς γὰρ ἄνθρωπος ὢν ἢ καὶ τἀναντία ὑπὸ λύπης πάσχων, σπεύδων τὸ μὲν ἑλεῖν ἀκαίρως, τὸ δὲ φυγεῖν, οὔθʼ ὁρᾶν οὔτε ἀκούειν ὀρθὸν οὐδὲν δύναται, λυττᾷ δὲ καὶ λογισμοῦ μετασχεῖν ἥκιστα τότε δὴ δυνατός. τὸ δὲ σπέρμα ὅτῳ πολὺ καὶ ῥυῶδες περὶ τὸν μυελὸν γίγνεται καὶ καθαπερεὶ δένδρον πολυκαρπότερον τοῦ συμμέτρου πεφυκὸς ᾖ, πολλὰς μὲν καθʼ ἕκαστον ὠδῖνας, πολλὰς δʼ ἡδονὰς κτώμενος ἐν ταῖς ἐπιθυμίαις καὶ τοῖς περὶ τὰ τοιαῦτα τόκοις, ἐμμανὴς τὸ πλεῖστον γιγνόμενος τοῦ βίου διὰ τὰς μεγίστας ἡδονὰς καὶ λύπας, νοσοῦσαν καὶ ἄφρονα ἴσχων ὑπὸ τοῦ σώματος τὴν ψυχήν, οὐχ ὡς νοσῶν ἀλλʼ ὡς ἑκὼν κακὸς δοξάζεται· τὸ δὲ ἀληθὲς ἡ περὶ τὰ ἀφροδίσια ἀκολασία κατὰ τὸ πολὺ μέρος διὰ τὴν ἑνὸς γένους ἕξιν ὑπὸ μανότητος ὀστῶν ἐν σώματι ῥυώδη καὶ ὑγραίνουσαν νόσος ψυχῆς γέγονεν. καὶ σχεδὸν δὴ πάντα ὁπόσα ἡδονῶν ἀκράτεια καὶ ὄνειδος ὡς ἑκόντων λέγεται τῶν κακῶν, οὐκ ὀρθῶς ὀνειδίζεται· κακὸς μὲν γὰρ ἑκὼν οὐδείς, διὰ δὲ πονηρὰν ἕξιν τινὰ τοῦ σώματος καὶ ἀπαίδευτον τροφὴν ὁ κακὸς γίγνεται κακός, παντὶ δὲ ταῦτα ἐχθρὰ καὶ ἄκοντι προσγίγνεται. καὶ πάλιν δὴ τὸ περὶ τὰς λύπας ἡ ψυχὴ κατὰ ταὐτὰ διὰ σῶμα πολλὴν ἴσχει κακίαν.
But when the bile flows in with more volume, it overpowers the fibrine by the heat it contains, and shakes it into disorder by its boiling up; and should it be capable of thus overpowering the fibrine continuously, it penetrates to the substance of the marrow and loosens from thence, by burning, the mooring-ropes of the soul, as it were of a ship, and sets it free. But when the bile is in smaller quantity and the body resists dissolution, then the bile itself is overpowered, and either it is ejected over the whole surface of the body, or else it is forced through the veins into the lower or the upper belly, being ejected from the body like fugitives from a city in revolt; and it produces diarrhoea and dysentery and all suchlike maladies. When a body has become diseased mainly from an excess of fire, it produces constant inflammations and fevers; when from air, quotidian fevers; when from water, tertian fevers, because that element is more sluggish than air or fire; and when from earth, which is the fourth and most sluggish of the elements and is purged in four-fold periods of time, it causes quartan fevers and is cured with difficulty. Such is the manner in which diseases of the body come about; and those of the soul which are due to the condition of the body arise in the following way. We must agree that folly is a disease of the soul; and of folly there are two kinds, the one of which is madness, the other ignorance. Whatever affection a man suffers from, if it involves either of these conditions it must be termed “disease”; and we must maintain that pleasures and pains in excess are the greatest of the soul’s diseases. For when a man is overjoyed or contrariwise suffering excessively from pain, being in haste to seize on the one and avoid the other beyond measure, he is unable either to see or to hear anything correctly, and he is at such a time distraught and wholly incapable of exercising reason. And whenever a man’s seed grows to abundant volume in his marrow, as it were a tree that is overladen beyond measure with fruit, he brings on himself time after time many pangs and many pleasures owing to his desires and the issue thereof, and comes to be in a state of madness for the most part of his life because of those greatest of pleasures and pains, and keeps his soul diseased and senseless by reason of the action of his body. Yet such a man is reputed to be voluntarily wicked and not diseased; although, in truth, this sexual incontinence, which is due for the most part to the abundance and fluidity of one substance because of the porosity of the bones, constitutes a disease of the soul. And indeed almost all those affections which are called by way of reproach “incontinence in pleasure,” as though the wicked acted voluntarily, are wrongly so reproached; for no one is voluntarily wicked, but the wicked man becomes wicked by reason of some evil condition of body and unskilled nurture, and these are experiences which are hateful to everyone and involuntary. And again, in respect of pains likewise the soul acquires much evil because of the body.
ΤΙ. ὅτου γὰρ ἂν ἢ τῶν ὀξέων καὶ τῶν ἁλυκῶν φλεγμάτων καὶ ὅσοι πικροὶ καὶ χολώδεις χυμοὶ κατὰ τὸ σῶμα πλανηθέντες ἔξω μὲν μὴ λάβωσιν ἀναπνοήν, ἐντὸς δὲ εἱλλόμενοι τὴν ἀφʼ αὑτῶν ἀτμίδα τῇ τῆς ψυχῆς φορᾷ συμμείξαντες ἀνακερασθῶσι, παντοδαπὰ νοσήματα ψυχῆς ἐμποιοῦσι μᾶλλον καὶ ἧττον καὶ ἐλάττω καὶ πλείω, πρός τε τοὺς τρεῖς τόπους ἐνεχθέντα τῆς ψυχῆς, πρὸς ὃν ἂν ἕκαστʼ αὐτῶν προσπίπτῃ, ποικίλλει μὲν εἴδη δυσκολίας καὶ δυσθυμίας παντοδαπά, ποικίλλει δὲ θρασύτητός τε καὶ δειλίας, ἔτι δὲ λήθης ἅμα καὶ δυσμαθίας. πρὸς δὲ τούτοις, ὅταν οὕτως κακῶς παγέντων πολιτεῖαι κακαὶ καὶ λόγοι κατὰ πόλεις ἰδίᾳ τε καὶ δημοσίᾳ λεχθῶσιν, ἔτι δὲ μαθήματα μηδαμῇ τούτων ἰατικὰ ἐκ νέων μανθάνηται, ταύτῃ κακοὶ πάντες οἱ κακοὶ διὰ δύο ἀκουσιώτατα γιγνόμεθα· ὧν αἰτιατέον μὲν τοὺς φυτεύοντας ἀεὶ τῶν φυτευομένων μᾶλλον καὶ τοὺς τρέφοντας τῶν τρεφομένων, προθυμητέον μήν, ὅπῃ τις δύναται, καὶ διὰ τροφῆς καὶ διʼ ἐπιτηδευμάτων μαθημάτων τε φυγεῖν μὲν κακίαν, τοὐναντίον δὲ ἑλεῖν. ταῦτα μὲν οὖν δὴ τρόπος ἄλλος λόγων. τὸ δὲ τούτων ἀντίστροφον αὖ, τὸ περὶ τὰς τῶν σωμάτων καὶ διανοήσεων θεραπείας αἷς αἰτίαις σῴζεται, πάλιν εἰκὸς καὶ πρέπον ἀνταποδοῦναι· δικαιότερον γὰρ τῶν ἀγαθῶν πέρι μᾶλλον ἢ τῶν κακῶν ἴσχειν λόγον. πᾶν δὴ τὸ ἀγαθὸν καλόν, τὸ δὲ καλὸν οὐκ ἄμετρον· καὶ ζῷον οὖν τὸ τοιοῦτον ἐσόμενον σύμμετρον θετέον. συμμετριῶν δὲ τὰ μὲν σμικρὰ διαισθανόμενοι συλλογιζόμεθα, τὰ δὲ κυριώτατα καὶ μέγιστα ἀλογίστως ἔχομεν. πρὸς γὰρ ὑγιείας καὶ νόσους ἀρετάς τε καὶ κακίας οὐδεμία συμμετρία καὶ ἀμετρία μείζων ἢ ψυχῆς αὐτῆς πρὸς σῶμα αὐτό· ὧν οὐδὲν σκοποῦμεν οὐδʼ ἐννοοῦμεν, ὅτι ψυχὴν ἰσχυρὰν καὶ πάντῃ μεγάλην ἀσθενέστερον καὶ ἔλαττον εἶδος ὅταν ὀχῇ, καὶ ὅταν αὖ τοὐναντίον συμπαγῆτον τούτω, οὐ καλὸν ὅλον τὸ ζῷον—ἀσύμμετρον γὰρ ταῖς μεγίσταις συμμετρίαις—τὸ δὲ ἐναντίως ἔχον πάντων θεαμάτων τῷ δυναμένῳ καθορᾶν κάλλιστον καὶ ἐρασμιώτατον. οἷον οὖν ὑπερσκελὲς ἢ καί τινα ἑτέραν ὑπέρεξιν ἄμετρον ἑαυτῷ τι σῶμα ὂν ἅμα μὲν αἰσχρόν, ἅμα δʼ ἐν τῇ κοινωνίᾳ τῶν πόνων πολλοὺς μὲν κόπους, πολλὰ δὲ σπάσματα καὶ διὰ τὴν παραφορότητα πτώματα παρέχον μυρίων κακῶν αἴτιον ἑαυτῷ,
For whenever the humors which arise from acid and saline phlegms, and all humors that are bitter and bilious wander through the body and find no external vent but are confined within, and mingle their vapor with the movement of the soul and are blended therewith, they implant diseases of the soul of all kinds, varying in intensity and in extent; and as these humors penetrate to the three regions of the Soul, according to the region which they severally attack, they give rise to all varieties of bad temper and bad spirits, and they give rise to all manner of rashness and cowardice, and of forgetfulness also, as well as of stupidity. Furthermore, when, with men in such an evil condition, the political administration also is evil, and the speech in the cities, both public and private, is evil; and when, moreover, no lessons that would cure these evils are anywhere learnt from childhood,—thus it comes to pass that all of us who are wicked become wicked owing to two quite involuntary causes. And for these we must always blame the begetters more than the begotten, and the nurses more than the nurslings; yet each man must endeavor, as best he can, by means of nurture and by his pursuits and studies to flee the evil and to pursue the good. This, however, forms a separate subject of discussion. Again, it is reasonable and proper to set forth in turn the subject complementary to the foregoing, namely the remedial treatment of body and mind, and the causes which conserve this. For what is good merits description more than what is evil. All that is good is fair, and the fair is not void of due measure; wherefore also the living creature that is to be fair must be symmetrical. Of symmetries we distinguish and reason about such as are small, but of the most important and the greatest we have no rational comprehension. For with respect to health and disease, virtue and vice, there is no symmetry or want of symmetry greater than that which exists between the soul itself and the body itself. But as regards these, we wholly fail to perceive or reflect that, whenever a weaker and inferior type of body is the vehicle of a soul that is strong and in all ways great,—or conversely, when each of these two is of the opposite kind,—then the creature as a whole is not fair, seeing that it is unsymmetrical in respect of the greatest of symmetries; whereas a creature in the opposite condition is of all sights, for him who has eyes to see, the fairest and most admirable. A body, for example, which is too long in the legs, or otherwise disproportioned owing to some excess, is not only ugly, but, when joint effort is required, it is also the source of much fatigue and many sprains and falls by reason of its clumsy motion, whereby it causes itself countless evils.
ΤΙ. ταὐτὸν δὴ διανοητέον καὶ περὶ τοῦ συναμφοτέρου, ζῷον ὃ καλοῦμεν, ὡς ὅταν τε ἐν αὐτῷ ψυχὴ κρείττων οὖσα σώματος περιθύμως ἴσχῃ, διασείουσα πᾶν αὐτὸ ἔνδοθεν νόσων ἐμπίμπλησι, καὶ ὅταν εἴς τινας μαθήσεις καὶ ζητήσεις συντόνως ἴῃ, κατατήκει, διδαχάς τʼ αὖ καὶ μάχας ἐν λόγοις ποιουμένη δημοσίᾳ καὶ ἰδίᾳ διʼ ἐρίδων καὶ φιλονικίας γιγνομένων διάπυρον αὐτὸ ποιοῦσα σαλεύει, καὶ ῥεύματα ἐπάγουσα, τῶν λεγομένων ἰατρῶν ἀπατῶσα τοὺς πλείστους, τἀναίται αἰτιᾶσθαι ποιεῖ· σῶμά τε ὅταν αὖ μέγα καὶ ὑπέρψυχον σμικρᾷ συμφυὲς ἀσθενεῖ τε διανοίᾳ γένηται, διττῶν ἐπιθυμιῶν οὐσῶν φύσει κατʼ ἀνθρώπους, διὰ σῶμα μὲν τροφῆς, διὰ δὲ τὸ θειότατον τῶν ἐν ἡμῖν φρονήσεως, αἱ τοῦ κρείττονος κινήσεις κρατοῦσαι καὶ τὸ μὲν σφέτερον αὔξουσαι, τὸ δὲ τῆς ψυχῆς κωφὸν καὶ δυσμαθὲς ἀμνῆμόν τε ποιοῦσαι, τὴν μεγίστην νόσον ἀμαθίαν ἐναπεργάζονται. μία δὴ σωτηρία πρὸς ἄμφω, μήτε τὴν ψυχὴν ἄνευ σώματος κινεῖν μήτε σῶμα ἄνευ ψυχῆς, ἵνα ἀμυνομένω γίγνησθον ἰσορρόπω καὶ ὑγιῆ. τὸν δὴ μαθηματικὸν ἤ τινα ἄλλην σφόδρα μελέτην διανοίᾳ κατεργαζόμενον καὶ τὴν τοῦ σώματος ἀποδοτέον κίνησιν, γυμναστικῇ προσομιλοῦντα, τόν τε αὖ σῶμα ἐπιμελῶς πλάττοντα τὰς τῆς ψυχῆς ἀνταποδοτέον κινήσεις, μουσικῇ καὶ πάσῃ φιλοσοφίᾳ προσχρώμενον, εἰ μέλλει δικαίως τις ἅμα μὲν καλός, ἅμα δὲ ἀγαθὸς ὀρθῶς κεκλῆσθαι. κατὰ δὲ ταὐτὰ ταῦτα καὶ τὰ μέρη θεραπευτέον, τὸ τοῦ παντὸς ἀπομιμούμενον εἶδος. τοῦ γὰρ σώματος ὑπὸ τῶν εἰσιόντων καομένου τε ἐντὸς καὶ ψυχομένου, καὶ πάλιν ὑπὸ τῶν ἔξωθεν ξηραινομένου καὶ ὑγραινομένου καὶ τὰ τούτοις ἀκόλουθα πάσχοντος ὑπʼ ἀμφοτέρων τῶν κινήσεων, ὅταν μέν τις ἡσυχίαν ἄγον τὸ σῶμα παραδιδῷ ταῖς κινήσεσι, κρατηθὲν διώλετο, ἐὰν δὲ ἥν τε τροφὸν καὶ τιθήνην τοῦ παντὸς προσείπομεν μιμῆταί τις, καὶ τὸ σῶμα μάλιστα μὲν μηδέποτε ἡσυχίαν ἄγειν ἐᾷ, κινῇ δὲ καὶ σεισμοὺς ἀεί τινας ἐμποιῶν αὐτῷ διὰ παντὸς τὰς ἐντὸς καὶ ἐκτὸς ἀμύνηται κατὰ φύσιν κινήσεις, καὶ μετρίως σείων τά τε περὶ τὸ σῶμα πλανώμενα παθήματα καὶ μέρη κατὰ συγγενείας εἰς τάξιν κατακοσμῇ πρὸς ἄλληλα, κατὰ τὸν πρόσθεν λόγον ὃν περὶ τοῦ παντὸς ἐλέγομεν, οὐκ ἐχθρὸν παρʼ ἐχθρὸν τιθέμενον ἐάσει πολέμους ἐντίκτειν τῷ σώματι καὶ νόσους, ἀλλὰ φίλον παρὰ φίλον τεθὲν ὑγίειαν ἀπεργαζόμενον παρέξει.
So likewise we must conceive of that compound of soul and body which we call the “living creature.” Whenever the soul within it is stronger than the body and is in a very passionate state, it shakes up the whole body from within and fills it with maladies; and whenever the soul ardently pursues some study or investigation, it wastes the body; and again, when the soul engages, in public or in private, in teachings and battles of words carried on with controversy and contention, it makes the body inflamed and shakes it to pieces, and induces catarrhs; and thereby it deceives the majority of so-called physicians and makes them ascribe the malady to the wrong cause. And, on the other hand, when a large and overbearing body is united to a small and weak intellect, inasmuch as two desires naturally exist amongst men, —the desire of food for the body’s sake, and the desire of wisdom for the sake of the most divine part we have,—the motions of the stronger part prevail and augment their own power, but they make that of the soul obtuse and dull of wit and forgetful, and thereby they produce within it that greatest of diseases, ignorance. From both these evils the one means of salvation is this—neither to exercise the soul without the body nor the body without the soul, so that they may be evenly matched and sound of health. Thus the student of mathematics, or of any other subject, who works very hard with his intellect must also provide his body with exercise by practising gymnastics; while he who is diligent in molding his body must, in turn, provide his soul with motion by cultivating music and philosophy in general, if either is to deserve to be called truly both fair and good. The various parts, likewise, must be treated in the same manner, in imitation of the form of the Universe. For as the body is inflamed or chilled within by the particles that enter it, and again is dried or moistened by those without, and suffers the affections consequent on both these motions, whenever a man delivers his body, in a state of rest, to these motions, it is overpowered and utterly perishes; whereas if a man imitates that which we have called the nurturer and nurse of the Universe, and never, if possible, allows the body to be at rest but keeps it moving, and by continually producing internal vibrations defends it in nature’s way against the inward and outward motions, and by means of moderate vibrations arranges the affections and particles which stray about in the body in their due reciprocal order, according to their affinities,—as described in the previous account which we have given of the Universe—then he will not suffer foe set beside foe to breed war in the body and disease, but he will cause friend to be set beside friend so as to produce sound health.
ΤΙ. τῶν δʼ αὖ κινήσεων ἡ ἐν ἑαυτῷ ὑφʼ αὑτοῦ ἀρίστη κίνησις—μάλιστα γὰρ τῇ διανοητικῇ καὶ τῇ τοῦ παντὸς κινήσει συγγενής—ἡ δὲ ὑπʼ ἄλλου χείρων· χειρίστη δὲ ἡ κειμένου τοῦ σώματος καὶ ἄγοντος ἡσυχίαν διʼ ἑτέρων αὐτὸ κατὰ μέρη κινοῦσα. διὸ δὴ τῶν καθάρσεων καὶ συστάσεων τοῦ σώματος ἡ μὲν διὰ τῶν γυμνασίων ἀρίστη, δευτέρα δὲ ἡ διὰ τῶν αἰωρήσεων κατά τε τοὺς πλοῦς καὶ ὅπῃπερ ἂν ὀχήσεις ἄκοποι γίγνωνται· τρίτον δὲ εἶδος κινήσεως σφόδρα ποτὲ ἀναγκαζομένῳ χρήσιμον, ἄλλως δὲ οὐδαμῶς τῷ νοῦν ἔχοντι προσδεκτέον, τὸ τῆς φαρμακευτικῆς καθάρσεως γιγνόμενον ἰατρικόν. τὰ γὰρ νοσήματα, ὅσα μὴ μεγάλους ἔχει κινδύνους, οὐκ ἐρεθιστέον φαρμακείαις. πᾶσα γὰρ σύστασις νόσων τρόπον τινὰ τῇ τῶν ζῴων φύσει προσέοικε. καὶ γὰρ ἡ τούτων σύνοδος ἔχουσα τεταγμένους τοῦ βίου γίγνεται χρόνους τοῦ τε γένους σύμπαντος, καὶ καθʼ αὑτὸ τὸ ζῷον εἱμαρμένον ἕκαστον ἔχον τὸν βίον φύεται, χωρὶς τῶν ἐξ ἀνάγκης παθημάτων· τὰ γὰρ τρίγωνα εὐθὺς κατʼ ἀρχὰς ἑκάστου δύναμιν ἔχοντα συνίσταται μέχρι τινὸς χρόνου δυνατὰ ἐξαρκεῖν, οὗ βίον οὐκ ἄν ποτέ τις εἰς τὸ πέραν ἔτι βιῴη. τρόπος οὖν ὁ αὐτὸς καὶ τῆς περὶ τὰ νοσήματα συστάσεως· ἣν ὅταν τις παρὰ τὴν εἱμαρμένην τοῦ χρόνου φθείρῃ φαρμακείαις, ἅμα ἐκ σμικρῶν μεγάλα καὶ πολλὰ ἐξ ὀλίγων νοσήματα φιλεῖ γίγνεσθαι. διὸ παιδαγωγεῖν δεῖ διαίταις πάντα τὰ τοιαῦτα, καθʼ ὅσον ἂν ᾖ τῳ σχολή, ἀλλʼ οὐ φαρμακεύοντα κακὸν δύσκολον ἐρεθιστέον. καὶ περὶ μὲν τοῦ κοινοῦ ζῴου καὶ τοῦ κατὰ τὸ σῶμα αὐτοῦ μέρους, ᾗ τις ἂν καὶ διαπαιδαγωγῶν καὶ διαπαιδαγωγούμενος ὑφʼ αὑτοῦ μάλιστʼ ἂν κατὰ λόγον ζῴη, ταύτῃ λελέχθω· τὸ δὲ δὴ παιδαγωγῆσον αὐτὸ μᾶλλόν που καὶ πρότερον παρασκευαστέον εἰς δύναμιν ὅτι κάλλιστον καὶ ἄριστον εἰς τὴν παιδαγωγίαν εἶναι. διʼ ἀκριβείας μὲν οὖν περὶ τούτων διελθεῖν ἱκανὸν ἂν γένοιτο αὐτὸ καθʼ αὑτὸ μόνον ἔργον· τὸ δʼ ἐν παρέργῳ κατὰ τὰ πρόσθεν ἑπόμενος ἄν τις οὐκ ἄπο τρόπου τῇδε σκοπῶν ὧδε τῷ λόγῳ διαπεράναιτʼ ἄν.
Further, as concerns the motions, the best motion of a body is that caused by itself in itself; for this is most nearly akin to the motion of intelligence and the motion of the Universe. Motion due to the agency of another is less good; and the least good motion is that which is imparted to a body lying in a state of rest and which moves it piecemeal and by means of others. Wherefore the motion that is best for purgings and renovations of the body consists in gymnastic exercises; and second-best is the motion provided by swaying vehicles, such as boats or any conveyances that produce no fatigue; while the third kind of motion, although useful for one who is absolutely driven to it, is by no means acceptable, under any other conditions, to a man of sense, it being the medical kind of purging by means of drugs. For no diseases which do not involve great danger ought to be irritated by drugging. For in its structure every disease resembles in some sort the nature of the living creature. For, in truth, the constitution of these creatures has prescribed periods of life for the species as a whole, and each individual creature likewise has a naturally predestined term of life, apart from the accidents due to necessity. For from the very beginning the triangles of each creature are constructed with a capacity for lasting until a certain time, beyond which no one could ever continue to live. With respect to the structure of diseases also the same rule holds good: whenever anyone does violence thereto by drugging, in despite of the predestined period of time, diseases many and grave, in place of few and slight, are wont to occur. Wherefore one ought to control all such diseases, so far as one has the time to spare, by means of dieting rather than irritate a fractious evil by drugging. Concerning both the composite living creature and the bodily part of it, how a man should both guide and be guided by himself so as to live a most rational life, let our statement stand thus. But first and with special care we must make ready the part which is to be the guide to the best of our power, so that it may be as fair and good as possible for the work of guidance. Now to expound this subject alone in accurate detail would in itself be a sufficient task. But treating it merely as a side-issue, if we follow on the lines of our previous exposition, we may consider the matter and state our conclusions not inaptly in the following terms.
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