πείθεται πᾶς ἥδιον ἢ βιάζεται (Dio Cassius, Historiae Romanae 8.36.3) → it's always more pleasant to be persuaded than to be forced
P. and V. πολλοῦ ἄξιος.
costly: P. and V. τίμιος, P. πολυτελής.