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
P. and V. ἀσμένως, ἡδέως, or use P. and V. adj. ἄσμενος, ἐκών (in agreement with subject).