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ἡ δ᾽ οὖν δύναμις ἡ ἐν ταῖς φλεψὶν ἡ αἱματοποιητικὴ προσαγορευομένη καὶ πᾶσα δ᾽ ἄλλη δύναμις ἐν τῷ πρός τι νενόηται: πρώτως μὲν γὰρ τῆς ἐνεργείας αἰτία, ἤδη δὲ καὶ τοῦ ἔργου κατὰ συμβεβηκός. ἀλλ᾽ εἴπερ ἡ αἰτία πρός τι, τοῦ γὰρ ὑπ᾽ αὐτῆς γενομένου μόνου, τῶν δ᾽ ἄλλων οὐδενός, εὔδηλον, ὅτι καὶ ἡ δύναμις ἐν τῷ πρός τι. καὶ μέχρι γ᾽ ἂν ἀγνοῶμεν τὴν οὐσίαν τῆς ἐνεργούσης αἰτίας, δύναμιν αὐτὴν ὀνομάζομεν, εἶναί τινα λέγοντες ἐν ταῖς φλεψὶν αἱματοποιητικήν, ὡσαύτως δὲ κἀν τῇ κοιλίᾳ πεπτικὴν κἀν τῇ καρδίᾳ σφυγμικὴν καὶ καθ᾽ ἕκαστον τῶν ἄλλων [p. 10] ἰδίαν τινὰ τῆς κατὰ τὸ μόριον ἐνεργείας. εἴπερ οὖν μεθόδῳ μέλλοιμεν ἐξευρήσειν, ὁπόσαι τε καὶ ὁποῖαί τινες αἱ δυνάμεις εἰσίν, ἀπὸ τῶν ἔργων αὐτῶν ἀρκτέον: ἕκαστον γὰρ αὐτῶν ὑπό τινος ἐνεργείας γίγνεται καὶ τούτων ἑκάστης προηγεῖταί τις αἰτία.
On the Natural Faculties. Galen. A.J. Brock. Cambridge, Mass. Harvard University Press. 1916.
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