Blasphemy And The Son And The Holy Spirit

Πολυδύναμον καὶ πολυθύλλητον ἐπεζήτηας ζήτημα, πολλοῖς μὲν ἐρευνηθὲν, μόνοις δὲ τοῖς θεοπνεύστοις καταληφθὲν, Ὃς ἂν εἴποι λόγον κατὰ τοῦ Υἰοῦ τοῦ ἀνθρώπου, ἀφεθήσεται αὐτῷ· ὃς δ' ἂν εἴπῃ κατὰ τοῦ Πνεύματος τοῦ ἁγίου, οὐκ ἀφεθήσεται αὐτῷ, οὔτε ἐν τῷ αἰῶνι τούτῳ, οὔτε ἐν τῷ μέλλοντι. Καὶ τί, ὅτι μιᾶς οὐσης τῆς οὐσίας τῆς θεῖκῆς Τριάδος, ἡ κατὰ τοῦ Υἱοῦ βλασφημία, ἔφης, οὐκ ἐκδικεῖται, ἀλλ' ἡ κατὰ τοῦ Πνεύματος μόνη; Ἄκουε τοίνυν· Ὅς ἂν εἴποι κατὰ τοῦ Υἱοῦ τοῦ ἀνθρώπου βλάσφημον λόγον, οὐ κρίνεται, εἶπεν ὁ Κύριος· ἐπειδὴ τοῖς λημῶσι τὸν τῆς τῆς διανοίας ὄφθαλμὸν, δυσκατάληπτος καὶ δυσθεώρητος ὁ ἠνωμένος ἀῥῥήτως Θεὸς τῇ εὐτελείᾳ τῆς φαινομένης σαρκὸς, ἀγνοουμένης τῆς κρυπτομένης θεότητος. Τοῖς δὲ καθαροῖς τὴν διάνοιαν, οἶς ἐπεφάνη ἡ σαρκωθεῖσα θεότης, οὐδε ἀπιστία ὅλως ἐγγέγονεν, οὐδὲ ἡ τῆς κρίσεως ἠπείληται ἀνταπόδοσις. Ἡ δὲ κατὰ τοῦ Πνεύματος τοῦ ἁγίου βλασφημία διὰ τοῦτο ὑπάρχει ἀσύγγνεσωος, ἐπειδὴ αὔτὰ τὰ ἔργα φαινόμενα, ἀγνώμονας καὶ ἀχαρίστους ἐλέγχει τοὺς βλασφημοῦντας. Τῶν γὰρ παθῶν ἔκκοπτομένων, καὶ τῶν δαιμόνων ἐλαυνομένων ἐν τῇ δυνάμει τῆς θεότητος, ἐν τῷ βεελζεβοὺλ ταύτας γίνεσθαι τὰς θεοσημείας οἱ γογγυσταὶ Ἰουδαῖοι ἐσυκοφάντησαν. Ταύτην οὖν τὴν βλασφημίαν τὴν κατὰ τῆς θείας τρανῶς οὖσαν οὐσίας, ἀσυγχώρητον εἶναι ὁ Κύριος ἀπεφήνατο. Ἅγιος Ἰσίδωρος Του Πηλουσιώτου, Βιβλιον Πρῶτον, Ἐπιστολή ΙΘ' Γοργονιῳ Source: Migne PG 78.220c-221b

You have asked a very powerful and weighty question, which many others have enquired into, and only those inspired with the Divine spirit have grasped it, 'He who speaks a word against the Son of Man, it shall be forgiven him, but he who speaks against the Holy Spirit, it shall not be forgiven him, not in this age, nor in the age to come.' 1 And why, since they are of one substance of the Divine Trinity, does He say that blasphemies against the Son of Man will not be punished, but only those against the Holy Spirit? Hear, then, that he who shall speak blasphemously against the Son of Man shall not be judged, says the Lord, because those who have the eye of the mind blinded to the secret God so hard to grasp and perceive united with the inferior and more overt flesh, do so in ignorance of the hidden Divinity. Understanding is for the pure, to whom the Divinity in the flesh has appeared, not for the faithless to whom it has never happened, and that is not denounced with a judgement of punishment. But he who speaks against the Holy Spirit lacks hope of forgiveness because its overt works refute the ignorance and unthankfulness of blasphemers. For when the power of Divinity casts out sickness and drives out demons, the Jews asserted that these Divine signs were done through Beelzebub. Whence the Lord proclaimed that this blasphemy, which opposes the revelation of the Divine essence, is without any forgiveness. Saint Isidore of Pelusium, Book 1, Letter 59, To Gorgonius 1 Mt 16.16