A Bishop Warned

Παρέργως ποιῇ τὴν τῶν θείων νόμων ἀνάγνωσιν, ἤ καὶ αὐτὴν ἀγνοεῖς τὴν ἀνάγνωσιν. Ἡνίκα γὰρ εἰς τὸν θεῖον ναὸν ἱερουργεῖν Ἀαρὼν, καὶ οἱ ἐξ ἐκείνου εἰσῄεσαν, πάντα τὰ ἐξ ἐρίας ἀποτιθέντες ἐσθήματα, στολὰς ἐκ λίνου παρεβάλλοντο ἐχούσας καὶ τὸ ἀπόῥῥητον, καὶ τῶν ἔξω θορύβων ἐπιλησμονεῖν σημαινούσας. Ὁ γὰρ Θεῷ λειτουργεῖν προσιὼν, οὐδὲν ἀλλότριον καὶ τῆς ὅλης ἐφόλκιον ἐπιφέρεσθαι δύναται. Εἰ τοίνυν μετὰ τοιαῦτα τεκμήρια βιάζεσθαι κατατολμᾷς τὴν ἁλήθειαν, συγχύσεις καὶ φλυαρίας ἐπεισφέρων τοῖς ἀνακτόροις, οἷς πᾶσα σιγὴ κεχρεώστηται, ὁμιλίας ἀτόπους, χειροθεσίας ἀθέσμους, εἰς ἔσχατον πέπεισο ἐξωθῶν σαυτὸν κατακρίσεως κίνδυνον. Ἅγιος Ἰσίδωρος Του Πηλουσιώτου, Βιβλίον Πρῶτον, Ἐπιστολὴ ΜΕ' Μαρτυριῳ Ἐπισκοπῳ Source: Migne PG 78.209c-212a

You either read the Divine laws carelessly, or you do not know the reading of them at all. For when Aaron and his successors entered into the temple for the sake of sacrifice, they took off every woollen vestment and clothed themselves in linen garb, 1 which contains a certain mystery: that we must put external concerns from the mind. He who approaches God to officiate cannot bring along with himself any foreign or unwanted matter. If, then, after such proofs you are still driven to insolence against the truth, and will yet bring in baseness to the sacred places, where silence is needful, with unbefitting words and sacrilegious laying on of hands, be persuaded that you lead yourself to the final peril of condemnation and casting out. Saint Isidore of Pelusium, Book 1, Letter 45, To Martyrius The Bishop 1 Exodus 28.5