πείθεται πᾶς ἥδιον ἢ βιάζεται (Dio Cassius, Historiae Romanae 8.36.3) → it's always more pleasant to be persuaded than to be forced
δή, δήποθεν, δήπου, δήπουθεν, δηλαδή, δῆθεν, δῆλα δή, δῆτα, ἀδιστάκτως, ἀμελέω, ἀνενδοιάστως, ἀνεντρέπτως, ἀόκνως