ἀπορητέον
From LSJ
πείθεται πᾶς ἥδιον ἢ βιάζεται (Dio Cassius, Historiae Romanae 8.36.3) → it's always more pleasant to be persuaded than to be forced
English (LSJ)
A one must raise the question, τί δήποτε . . Ph.1.336; περί τινος Plu.Fr.2.6.
Spanish (DGE)
hay que objetar τί δήποτε ... Ph.1.336
•hay que presentar el problema de πῶς γίγνεται, πότερα ... ἢ ... Plu.Pars.An.6.