[331] _De mundi opif._ 5 (i. 5): this is the most explicit expression of his theory of the nature of matter. It may be supplemented by _de plant Noe_, 1 (i. 329), τὴν οὐσίαν ἄτακτον καὶ συγκεχυμένην οὖσαν ἐξ αὑτῆς εἰς τάξιν ἐξ ἀταξίας καὶ ἐκ συγχύσεως εἰς διάκρισιν ἄγων ὁ κοσμοπλάστης μορφοῦν ἤρξατο: _quis rer. div. her._ 27 (i. 492): _de somn._ 2. 6 (i. 665): οὐσία is the more usual word, but ὕλη is sometimes found, e.g. _de plant Noe_, 2 (i. 330): the conception underlying either word is more Stoical than Platonic, i.e. it is rather that of matter having the property of resistance than that of potential matter or empty space: hence in _de profug._ 2 (i. 547), τὴν ἄποιον καὶ ἀνείδεον καὶ ἀσχημάτιστον οὐσίαν is contrasted, in strictly Stoical phraseology, with τὸ κινοῦν αἴτιον. [332] _De sacrif._ 13 (ii. 261). [333] The terms λόγοι and ἰδέαι are common. Instances of the other terms are the following: angels, _de confus. ling._ 8 (1. 408), τῶν θείων ἔργων καὶ λόγων οὓς καλεῖν ἔθος ἀγγέλους: _de somn._ i. 19 (i. 638), ἀθανάτοις λόγοις οὓς καλεῖν ἔθος ἀγγέλους: _Leg. alleg._ 3. 62 (i. 122), τοὺς ἀγγέλους καὶ λόγους αὐτοῦ: δαίμονες, _de gigant._ 2. 2 (i. 263), οὓς ἄλλοι φιλόσοφοι δαίμονας, ἀγγέλους Μωϋσῆς εἴωθεν ὀνομάζειν: so, in identical words, _de somn._ 1. 22 (i. 642): ἀριθμοὶ and μέτρα, _quis rer. div. heres._ 31 (i. 495), πᾶσιν ἀριθμοῖς καὶ πάσαις ταῖς πρὸς τελειότητα ἰδέαις καταχρησαμένου τοῦ πεποιηκότος: _de mund. opif._ 9 (i. 7), ἰδέαι καὶ μέτρα καὶ τύποι καὶ σφραγῖδες: cf. _de monarch._ 6 (ii. 219), τὰ ἄπειρα καὶ ἀόριστα καὶ ἀσχημάτιστα περατοῦσαι καὶ περιορίζουσαι καὶ σχηματίζουσαι. [334] The clearest instance of the identification is probably in _de monarch._ 6 (ii. 218, 219), where God tells Moses that so far from Himself being cognizable, not even the powers that minister to Him are cognizable in their essence; but that as seals are known from their impressions, τοιαύτας ὑποληπτέον καὶ τὰς περὶ ἐμὲ δυνάμεις ἀποίοις ποιότητας καὶ μορφὰς ἀμόρφοις καὶ μηδὲν τῆς ἀϊδίου φύσεως μεταλλομένας μήτι μειουμένας. [335] _De mund. opif._ 6 (i. 5), οὐδὲν ἂν ἕτερον εἴποι τὸν νοητὸν εἶναι κόσμον ἢ θεοῦ λόγον ἤδη κοσμοποιοῦντος: _vit. Mos._ 3. 13 (ii. 154), τῶν ἀσωμάτων καὶ παραδειγματικῶν ἰδεῶν ἐξ ὧν ὁ νοητὸς ἐπάγη κόσμος: so _de confus. ling._ 34 (i. 431): cf. the Stoical definition of λόγος in Epictet. _Diss._ 1. 20. 5, as σύστημα ἐκ ποιῶν φαντασιῶν. [336] _De mund. opif._ 4 (i. 4): the same conception is expressed in less figurative language in _Leg. alleg._ 1. 9 (i. 47), πρὶν ἀνατεῖλαι κατὰ μέρος αἰσθητὰ ἦν τὸ γενικὸν αἰσθητὸν προμηθείᾳ τοῦ πεποιηκότος. [337] δύναμις κοσμοποιητική, _de mund. οpif._ 5 (i. 5); δύναμις ποιητική _de profug._ 18 (i. 560).