ὃ γὰρ βούλεται, τοῦθ' ἕκαστος καὶ οἴεται → what he wishes to be true, each person also believes to be true | what he wishes, each person also believes
ἤστην: ἀντὶ ἤττην, γ. δυϊκ. παρατ. τοῦ εἰμὶ (sum).
2ᵉ duel impf. épq. de εἰμί.