Plutarch, De Iside et Osiride 79 (part 1)

εἰ δὲ καὶ περὶ τῶν θυμιωμένων ἡμέρας ἑκάστης εἰπεῖν, ὥσπερ ὑπεσχόμην, ἐκεῖνο ἂν διανοηθείη τις πρότερον, ὡς ἀεὶ μὲν οἱ ἄνδρες ἐν σπουδῇ μεγίστῃ τίθενται τὰ πρὸς ὑγίειαν ἐπιτηδεύματα, μάλιστα δʼ ἐν ταῖς ἱερουργίαις καὶ ταῖς ἁγνείαις καὶ διαίταις οὐχ ἧττον ἐστι τοῦ ὁσίου τὸ ὑγιεινόν. . οὐ γὰρ ᾤοντο καλῶς ἔχειν οὔτε σώμασιν οὔτε ψυχαῖς ὑπούλοις καὶ νοσώδεσι θεραπεύειν τὸ καθαρὸν καὶ ἀβλαβὲς πάντῃ καὶ ἀμίαντον. ἐπεὶ τοίνυν ὁ ἀήρ, ᾧ πλεῖστα χρώμεθα καὶ σύνεσμεν, οὐκ ἀεὶ τὴν αὐτὴν ἔχει διάθεσιν καὶ κρᾶσιν, ἀλλὰ νύκτωρ πυκνοῦται καὶ πιέζει τὸ σῶμα καὶ συνάγει τὴν ψυχὴν εἰς τὸ δύσθυμον καὶ πεφροντικὸς οἷον ἀχλυώδη γιγνομένην καὶ βαρεῖαν, ἀναστάντες εὐθὺς ἐπιθυμιῶσι ῥητίνην, θεραπεύοντες καὶ καθαίροντες τὸν ἀέρα τῇ διακρίσει καὶ τὸ σύμφυτον τῷ σώματι πνεῦμα μεμαρασμένον ἀναρριπίζοντες, ἐχούσης τι τῆς ὀσμῆς σφοδρὸν καὶ καταπληκτικόν. αὖθις δὲ μεσημβρίας αἰσθανόμενοι σφόδρα πολλὴν καὶ βαρεῖαν ἀναθυμίασιν ἀπὸ γῆς ἕλκοντα βίᾳ τὸν ἥλιον καὶ καταμιγνύοντα τῷ ἀέρι, τὴν σμύρναν ἐπιθυμιῶσι. διαλύει γὰρ ἡ θερμότης καὶ σκίδνησι τὸ συνιστάμενον ἐν τῷ περιέχοντι θολερὸν καὶ ἰλυῶδες. καὶ γὰρ οἱ ἰατροὶ πρὸς τὰ λοιμικὰ πάθη βοηθεῖν δοκοῦσι φλόγα πολλὴν ποιοῦντες ὡς λεπτύνουσαν τὸν ἀέρα· λεπτύνει δὲ βέλτιον, ἐὰν εὐώδη ξύλα κάωσιν, οἷα κυπαρίττου καὶ ἀρκεύθου καὶ πεύκης. Ἄκρωνα γοῦν τὸν ἰατρὸν ἐν Ἀθήναις ὑπὸ τὸν μέγαν λοιμὸν εὐδοκιμῆσαι λέγουσι, πῦρ κελεύοντα παρακάειν τοῖς νοσοῦσιν·

If, as I have promised, I must now speak of the offerings of incense which are made each day, one should first consider that this people always lays the very greatest stress upon those practices which are conducive to health. Especially in their sacred services and holy living and strict regimen the element of health is no less important than that of piety. For they did not deem it proper to serve that which is pure and in all ways unblemished and unpolluted with either bodies or souls that were unhealthy and diseased. Since, then, the air, of which we make the greatest use and in which we exist, has not always the same consistency and composition, but in the night-time becomes dense and oppresses the body and brings the soul into depression and solicitude, as if it had become befogged and heavy, therefore, immediately upon arising, they burn resin on their altars, revivifying and purifying the air by its dissemination, and fanning into fresh life the languished spirit innate in the body, inasmuch as the odour of resin contains something forceful and stimulating. Again at midday, when they perceive that the sun is forcibly attracting a copious and heavy exhalation from the earth and is combining this with the air, they burn myrrh on the altars; for the heat dissolves and scatters the murky and turgid concretions in the surrounding atmosphere. In fact, physicians seem to bring relief to pestilential affections by making a large blazing fire, for this rarefies the air. But the rarefication is more effective if they burn fragrant woods, such as that of the cypress, the …