Cf. Demosthenes, Olynthiac 3.19.9: ὃ γὰρ βούλεται, τοῦθ' ἕκαστος καὶ οἴεται ("what he wishes [to be true], each person also believes [to be true]").Also Julius Caesar, Gallic War 3.18: fere libenter homines id quod volunt credunt ("people quite cheerfully believe what they wish [to be true]").