Passage 1.8.3
Δημοσθένης δέ ὡς τὸ δεύτερον ἔφυγε, περαιοῦται καὶ τότε ἐς τὴν Καλαυρείαν, ἔνθα δὴ πιὼν φάρμακον ἐτελεύτησεν· φυγάδα τε Ἕλληνα μόνον τοῦτον Ἀντιπάτρῳ καὶ Μακεδόσιν οὐκ ἀνήγαγεν Ἀρχίας. ὁ δὲ Ἀρχίας οὗτος Θούριος ὢν ἔργον ἤρατο ἀνόσιον· ὅσοι Μακεδόσιν ἔπραξαν ἐναντία πρὶν ἢ τοῖς Ἕλλησι τὸ πταῖσμα τὸ ἐν Θεσσαλίᾳ γενέσθαι, τούτους ἦγεν Ἀρχίας Ἀντιπάτρῳ δώσοντας δίκην. Δημοσθένει μὲν ἡ πρὸς Ἀθηναίους ἄγαν εὔνοια ἐς τοῦτο ἐχώρησεν· εὖ δέ μοι λελέχθαι δοκεῖ ἄνδρα ἀφειδῶς ἐκπεσόντα ἐς πολιτείαν καὶ πιστὰ ἡγησάμενον τὰ τοῦ δήμου μήποτε καλῶς τελευτῆσαι.
When Demosthenes went into exile for the second time, he crossed at that time also to Calaureia, where indeed he ended his life by taking poison. He alone among the Greek exiles was not surrendered by Archias to Antipater and the Macedonians. This Archias, though a native of Thurii, undertook an impious task: all those Greeks who had opposed the Macedonians before the decisive defeat in Thessaly, Archias delivered up to Antipater for punishment. Demosthenes' exceeding goodwill toward the Athenians led him to this end; and it seems well said that he was a man who plunged recklessly into public affairs and believed faithfully that nothing connected with democracy could ever conclude happily.