The Fourth Sentence of the Letter to Theodore as Transcribed by Agamemnon Tselikas

Εἰ γὰρ καὶ το ἀληθὲς λέγοιεν, οὐδ᾽ οὕτω συμφωνοίη ἂν αὐτοῖς ὁ τῆς ἀληθείας ἐραστής

Tselikas is right with regards to the missing accent on το. 

Εἰ γὰρ καὶ τὸ ἀληθὲς λέγοιεν, οὐδ᾽ οὕτω συμφωνοίη ἂν αὐτοῖς ὁ τῆς ἀληθείας ἐραστής. 

"For even if they were to speak the truth, the lover of truth would not agree with them so much."