The commandment is not to blame; sin is not a substance
Eusebius is defending the goodness of the law and commandment against those who would blame them for sin, and is beginning to interpret Romans 7 into the person of Adam.
But so that no one would blame the commandment or the God who gave it, he used a neighboring and kindred word, saying: "We know that the law is holy, and the commandment is holy and just and good" (Romans 7:12). Since sin itself—that is, the devil—is not sin by nature or substance, he brings in the next statement: "so that sin might become sinful beyond measure through the commandment" (Romans 7:13). For what exists as a substance will not admit the more and the less; it is what it is, always being what it is in its substance. But for something that comes into being and has things come upon it—whether little or beyond measure—it is other in substance than the things that come upon it. For quantity is not substance but is around substance, not being substance itself. Therefore the one called sin by the apostle, since it admits the more in its sinning, so that sin might become sinful beyond measure—this one also received a beginning of being sin, in the way that it is sin, not being sinful beyond measure in the beginning according to its having sinned. This is why he indicates the increase of its becoming sinful beyond measure in a time to come, saying: "so that sin might become sinful beyond measure through the commandment" (Romans 7:13). But if they should say: How could the commandment and the law be good and just? How could they be holy, when through the occasion they provided sin became sinful beyond measure? Let them hear in response that it is not the case that if something is harmed, the occasion through which it is harmed is already base and evil. For it is not because those who gaze at the sun immoderately and without measure are harmed in their eyes that we call the sun evil; nor is it because the devil became sinful beyond measure by having plotted against the Son of God that we say the Son of God is base and evil. "I know that nothing good dwells in me, that is, in my flesh" (Romans 7:18). Now he interprets this into the person of Adam. And because he was deprived of having God in himself, he exchanged death for true life—for not only did the common death of his members seize him, but also the death of disobedience entered against his soul. For the ruling death reigned especially before the coming of Christ, holding disobedience as the law and scepter of its kingdom over all. But the kingdom of death is not without beginning or unbegotten; for dying comes from the living, and one person's disobedience comes from the obedience of those who obey. "For the willing lies beside me, but the working out of the good does not" (Romans 7:18). "For the good I want, this I do not do, but what I hate, this I practice" (Romans 7:19). If the willing alone is in us, and the working out of the good that is willed is not in us, then the good God sent the souls of the same substance as himself into bodies in vain. For what is dear to him and to them they do not do; they do not enact it, but only will it—and perhaps not even that, for it is unclear.
Greek
ἵνα δὲ μὴ τὴν ἐντολὴν ἢ τὸν ταύτην δεδωκότα θεὸν αἰτιάσωνταί τινες, γείτονι καὶ ὁμοσπόρῳ ἐχρήσατο ῥήματι τοιάδε φάσκων· οἴδαμεν δὲ ὅτι ὁ νόμος ἅγιος καὶ ἡ ἐντολὴ ἁγία καὶ δικαία καὶ
ἀγαθή. Ἐπεὶ οὖν οὐδ' αὐτὴ ἡ ἁμαρτία, τοῦτ' ἔστιν ὁ διάβολος, φύσει καὶ οὐσίᾳ ἁμαρτία ἐστίν, ἐπιφέρει λέγων· ἵνα γένηται καθ' ὑπερ 4 βολὴν ἁμαρτωλὸς ἡ ἁμαρτία διὰ τῆς ἐντολῆς. τὸ γὰρ κατ' οὐσίαν τὶ ὂν τὸ πλέον καὶ τὸ ἔλαττον οὐκ ἐπιδέξεται· ἔστιν γὰρ ὅπερ ἐστίν, ἀεὶ τοῦτο ὂν ὅπερ ἐστὶν οὐσιωδῶς. τῷ γὰρ γινομένῳ καὶ ἐπιγινομένῳ τι, εἴτε ὀλίγον εἴτε καθ' ὑπερβολήν, ἕτερός ἐστι κατ' οὐσίαν τῶν αὐτῷ ἐπιγινομένων· τὸ γὰρ πόσον οὐκ οὐσία ἀλλὰ περὶ τὴν οὐσίαν ἐστίν, οὐκ ὂν οὐσία. ἡ ἄρα τοίνυν καλουμένη ὑπὸ τοῦ ἀποστόλου ἁμαρτία τὸ πλέον ἐπιδεχομένη ἁμαρτήσειν, ἵνα γένηται καθ' ὑπερβολὴν ἁμαρτωλὸς ἡ ἁμαρτία. ἄρα καὶ τοῦ εἶναι ἁμαρτία, ᾗ ἁμαρτία ἐστίν, ἀρχὴν ἔλαβεν, οὐκ οὖσα καθ' ὑπερβολὴν ἐν ἀρχῇ κατὰ τὸ ἡμαρτηκέναι ἁμαρτωλὸς ἡ ἁμαρτία. διὸ δὴ καὶ τὴν ἐπίτασιν τοῦ γενέσθαι καθ' ὑπερβολὴν ἁμαρτωλὸν ἐσομένῳ χρόνῳ σημαίνει οὕτω λέγων· ἵνα γένηται καθ' ὑπερβολὴν ἁμαρτωλὸς ἡ ἁμαρτία διὰ τῆς ἐντολῆς. εἰ δὲ λέγοιεν· καὶ πῶς ἂν εἴη ἀγαθὴ καὶ δικαία; πῶς δὲ ἁγία ἡ ἐντολὴ καὶ ὁ νόμος, ὁπότε διὰ τῆς ἀφορμῆς αὐτῶν 2 ἁμαρτωλὸς καθ' ὑπερβολὴν ἐγένετο ἁμαρτωλὸς ἡ ἁμαρτία; πρὸς ταῦτα ἀκουέτωσαν ὅτι οὐκ, εἴ τι καταβλάπτεται, ἤδη καὶ ἡ ἀφορμὴ δι' ἣν βλάπτεται φαύλη ἐστὶ καὶ πονηρά· οὐδὲ γὰρ ὅτι οἱ ἀνόδως καὶ ἀμέτρως ἐνατενίζοντες τῷ ἡλίῳ βλάπτονται τὰς ὄψεις, ἤδη καὶ τὸν ἥλιόν φαμεν πονηρόν· οὐδ' ὅτι καθ' ὑπερβολὴν ὁ διάβολος ἁμαρτωλὸς γέγονε τῷ ἐπικεχειρηκέναι κατὰ τοῦ υἱοῦ τοῦ θεοῦ, ἤδη καὶ τὸν υἱὸν τοῦ θεοῦ φαῦλον καὶ πονηρὸν εἶναι λέγομεν. Οἶδα δὲ ὅτι οὐκ οἰκεῖ ἐν ἐμοί, τοῦτ' ἔστιν ἐν τῇ σαρκί μου, ἀγαθόν. νῦν εἰς τὸ τοῦ Ἀδὰμ πρόσωπον ἐξηγεῖται. καὶ ὅτι στερηθεὶς τὸν θεὸν ἔχειν ἐν ἑαυτῷ, ἀντὶ τῆς ὄντως ζωῆς θάνατον καταλλαξάμενος–καὶ γὰρ θάνατος οὐχ ὁ κοινὸς μόνος τῶν μελῶν αὐτοῦ ἐκράτησεν, ἀλλὰ καὶ ὁ τῆς παρακοῆς κατὰ τῆς ψυχῆς αὐτοῦ εἰσβαλών· μάλιστα γὰρ ὁ κρατῶν θάνατος πρὸ τῆς τοῦ Χριστοῦ ἐπιδημίας ἐβασίλευσε, κατὰ πάντων νόμον καὶ σκῆπτρον τῆς ἑαυτοῦ βασιλείας ἔχων τὴν παρακοήν. ἀλλ' οὐκ ἄναρχος ἢ ἀγέννητος ἡ τοῦ θανάτου βασιλεία· ἐκ γὰρ τῶν ζώντων τὸ τεθνάναι συμβαίνει, καὶ ἐκ τῆς τῶν ὑπηκόων ὑπακοῆς τὸ παρακοῦσαί τινα. τὸ γὰρ θέλειν παράκειταί μοι, τὸ δὲ κατεργάζεσθαι τὸ καλὸν οὔ· ὃ γὰρ θέλω ἀγαθὸν τοῦτο οὐ ποιῶ, ἀλλ' ὃ μισῶ τοῦτο πράσσω. εἰ τὸ θέλειν μόνον ἐν ἡμῖν ἔστιν, τὸ δὲ κατεργάζεσθαι τὸ θεληθὲν καλὸν οὐκ ἔστιν ἐν ἡμῖν, εἰς μάτην ὁ ἀγαθὸς θεὸς τὰς ὁμοουσίας ἑαυτοῦ ψυχὰς ἐν τοῖς σώμασι κατέπεμψεν· τὸ γὰρ αὐτῷ καὶ αὐταῖς φίλον οὐ πράττουσιν, οὐκ ἐνεργοῦσιν, ἀλλὰ μόνον θέλουσιν· τάχα δὲ οὐδ' αὐτό, ἄδηλον γάρ.