ταῦτ᾽ ἐν ἑτέροις μὲν ἴσως ἂν ὤκνουν εἰπεῖν: a present unfulfilled condition, the protasis of which is contained in the words ἐν ἑτέροις (= εἰ ἐν ἑτέροις ἔλεγον).
ὡς οὐκ ἂν πιστευθείς: ὡς with a participle often replaces a causal clause expressing a reason present in the mind of the subject of the principal verb: here ὡς οὐκ ἂν πιστευθείς is equivalent to νομίζων ὅτι οὐκ ἂν ἐπιστεύθην, the protasis of the condition being supplied by ἐκ τῶν λεγομένων, ‘as a result of my words’ (= εἰ ταῦτα ἔλεξα).
μετὰ λογισμοῦ, ‘in obedience to reason’ (F.).