"a oneness is perceived between the Son and the Father"

"Nevertheless, 'None is good,' he says, 'save one, God'. This is quoted by our opponents. Neither do I myself reject the saying, yet I do not for that reason deny the deity of the Son. But one who confesses the Lord as God, by that confession surely claims at the same time his goodness. For if goodness is proper to God, and the Lord is God, then the Son is proved by these premises to be good. Yet he says that the word 'one' precludes the Son from participating in the good. It is however easy to show that not even this 'one' separates the Father from the Son. In all other cases 'one' has a meaning admitting no duality; in the case of the Father and the Son however, the 'one' is not envisaged as singularity: 'I and the Father are one,' he says. If therefore there is one who is Good, and a oneness is perceived between the Son and the Father, then the Lord, in attesting the unity of goodness, by 'one' claimed this title for himself, since he is one with the Father, and not broken off from the unity of nature."
 
Ἀλλ' οὐδείς, φησίν, ἀγαθός, εἰ μὴ εἷς ὁ θεός· τοῦτο παρὰ τῶν ἐναντίων προφέρεται. οὐδὲ αὐτὸς ἀποβάλλω τὸν λόγον, οὐ μὴν ἀρνοῦμαι διὰ τοῦτο τοῦ υἱοῦ τὴν θεότητα. ὁ δὲ ὁμολογῶν θεὸν εἶναι τὸν κύριον καὶ τὸ ἀγαθὸν αὐτῷ πάντως διὰ τῆς ὁμολογίας ταύτης συνεμαρτύρησεν. εἰ γὰρ ἴδιον θεοῦ ἡ ἀγαθότης, θεὸς δὲ ὁ κύριος, ἀγαθὸς ἄρα διὰ τῶν τεθέντων ὁ υἱὸς ἀναπέφηνεν. ἀλλά, φησί, τοῦ ἑνὸς ἡ λέξις ἀποκρίνει τὸν υἱὸν τῆς τοῦ ἀγαθοῦ κοινωνίας. ἀλλὰ ῥᾴδιον δεῖξαι ὅτι οὐδὲ τὸ ἓν τοῦτο διαχωρίζει τοῦ 3.9.21 υἱοῦ τὸν πατέρα. ἐπὶ μὲν γὰρ τῶν ἄλλων ἁπάντων τὸ ἓν ἀσυνδύαστον ἔχει τὴν σημασίαν, ἐπὶ δὲ τοῦ πατρός τε καὶ τοῦ υἱοῦ τὸ ἓν οὐκ ἐν μονότητι καθορᾶται. Ἐγὼ γάρ, φησί, καὶ ὁ πατὴρ ἕν ἐσμεν. εἰ οὖν εἷς μὲν ὁ ἀγαθός, ἑνότης δέ τις ἐν τῷ υἱῷ καὶ τῷ πατρὶ θεωρεῖται, ἄρα ὁ κύριος τῷ ἑνὶ μαρτυρήσας τὴν ἀγαθότητα καὶ ἑαυτῷ διὰ τοῦ ἑνὸς τὴν ἐπωνυμίαν ταύτην προσεμαρτύρησε τῷ ἓν ὄντι πρὸς τὸν πατέρα καὶ οὐκ ἀπορρηγνυμένῳ τῆς κατὰ
φύσιν ἑνότητος. (Con. Eun. 3,9,20-21)