Athenagoras, Plea for the Christians 10
I have sufficiently demonstrated that we are not atheists, for we worship one God who is unbegotten, eternal, invisible, impassible, incomprehensible, and uncircumscribed. He is apprehended only by mind and reason, and encompassed by light, beauty, spirit, and indescribable power. Through his own Word, he has made, adorned, and holds together all things. We also acknowledge the Son of God; let no one consider it laughable that God has a Son. We do not think as the poets who mythologize, portraying gods no better than men; our conception of God the Father and the Son is altogether different. The Son of God is the Father's Reason (Logos) in idea and actuality. Through him and because of him all things came to be, for the Father and the Son are one. Since the Son is in the Father and the Father in the Son, united by the unity and power of the Spirit, the Son of God is the Mind and Reason of the Father. If, in excess of cleverness, you demand to know what the 'Child' desires, I will answer briefly: he is the Father's firstborn, not as one who came into existence. From the beginning God, being an eternal Mind, possessed his own Reason within himself, being eternally rational. Rather, the Son proceeded as Idea and Energy before material substances existed, when divine nature and useless earth lay beneath, the heavier elements mixed with the lighter upon them. The prophetic Spirit agrees with this Reason, saying, "The Lord created me the beginning of his ways for his works" (Proverbs 8:22). We also declare that the Holy Spirit who energizes those who speak prophetically is an effluence of God, flowing out and returning like a ray of the sun. Who would not be perplexed to hear us called atheists when we proclaim God the Father, God the Son, and the Holy Spirit, demonstrating both their power in unity and their distinction in order? Our theology does not rest on these truths alone; we also affirm a multitude of angels and ministers. The Creator and Maker of the world, God, distributed and ordered them through his own Word to govern the elements, the heavens, the world, all things in it, and their harmonious arrangement.
Greek
Τὸ μὲν οὖν ἄθεοι μὴ εἶναι, ἕνα τὸν ἀγένητον καὶ ἀΐδιον καὶ ἀόρατον καὶ ἀπαθῆ καὶ ἀκατάληπτον καὶ ἀχώρητον, νῷ μόνῳ καὶ λόγῳ καταλαμβανόμενον, φωτὶ καὶ κάλλει καὶ πνεύματι καὶ δυνάμει ἀνεκδιηγήτῳ περιεχόμενον, ὑφ᾿ οὗ γεγένηται τὸ πᾶν διὰ τοῦ αὐτοῦ λόγου καὶ διακεκόσμηται καὶ συγκρατεῖται, θεὸν ἄγοντες, ἱκανῶς μοι δέδεικται. Νοοῦμεν γὰρ καὶ υἱὸν τοῦ θεοῦ. Καὶ μή μοι γελοῖόν τις νομίσῃ τὸ υἱὸν εἶναι τῷ θεῷ. Οὐ γὰρ ὡς ποιηταὶ μυθοποιοῦσιν, οὐδὲν βελτίους τῶν ἀνθρώπων δεικνῦντες τοὺς θεούς, ἢ περὶ τοῦ θεοῦ καὶ πατρὸς ἢ περὶ τοῦ υἱοῦ πεφρονήκαμεν. Ἀλλ᾿ ἔστιν ὁ υἱὸς τοῦ θεοῦ λόγος τοῦ πατρὸς ἐν ἰδέᾳ καὶ ἐνεργείᾳ· πρὸς αὐτοῦ γὰρ καὶ δι᾿ αὐτοῦ πάντα ἐγένετο, ἑνὸς ὄντος τοῦ πατρὸς καὶ τοῦ υἱοῦ. Ὄντος δὲ τοῦ υἱοῦ ἐν πατρὶ καὶ πατρὸς ἐν υἱῷ, ἑνότητι καὶ δυνάμει πνεύματος, νοῦς καὶ λόγος τοῦ πατρὸς ὁ υἱὸς τοῦ θεοῦ. Εἰ δὲ δι᾿ ὑπερβολὴν συνέσεως σκοπεῖν ὑμῖν ἔπεισιν, ὁ παῖς τί βούλεται, ἐρῶ διὰ βραχέων πρῶτον γέννημα εἶναι τῷ πατρί, οὐχ ὡς γενόμενον (ἐξ ἀρχῆς γὰρ ὁ θεός, νοῦς ἀΐδιος ὤν, εἶχεν αὐτὸς ἐν ἑαυτῷ τὸν λόγον, ἀϊδίως λογικὸς ὤν), ἀλλ᾿ ὡς τῶν ὑλικῶν ξυμπάντων, ἀποίου φύσεως καὶ γῆς ἀχρείας ὑποκειμένων δίκην, μεμιγμένων τῶν παχυμερεστέρων πρὸς τὰ κουφότερα ἐπ᾿ αὐτοῖς, ἰδέα καὶ ἐνέργεια εἶναι προελθών. Συνᾴδει δὲ τῷ λόγῳ καὶ τὸ προφητικὸν πνεῦμα· Κύριος γάρ, φησίν, ἔκτισέ με ἀρχὴν ὁδῶν αὐτοῦ εἰς ἔργα αὐτοῦ. Καίτοι καὶ αὐτὸ τὸ ἐνεργοῦν τοῖς ἐκφωνοῦσι προφητικῶς ἅγιον πνεῦμα ἀπόῤῥοιαν εἶναί φαμεν τοῦ θεοῦ, ἀποῤῥέον καὶ ἐπαναφερόμενον ὡς ἀκτῖνα ἡλίου.Τίς οὖν οὐκ ἂν ἀπορήσαι, λέγοντας θεὸν πατέρα καὶ υἱὸν θεὸν καὶ πνεῦμα ἅγιον, δεικνύντας αὐτῶν καὶ τὴν ἐν τῇ ἑνώσει δύναμιν καὶ τὴν ἐν τῇ τάξει διαίρεσιν, ἀκούσας ἀθέους καλουμένους; Καὶ οὐκ ἐπὶ τούτοις τὸ θεολογικὸν ἡμῶν ἵσταται μέρος· ἀλλὰ καὶ πλῆθος ἀγγέλων καὶ λειτουργῶν φαμεν, οὓς ὁ ποιητὴς καὶ δημιουργὸς κόσμου θεὸς διὰ τοῦ παρ᾿ αὐτοῦ λόγου διένειμε καὶ διέταξε περί τε τὰ στοιχεῖα εἶναι καὶ τοὺς οὐρανοὺς καὶ τὸν κόσμον καὶ τὰ ἐν αὐτῷ καὶ τὴν τούτων εὐταξίαν.