You may be acting in the best interests of the horse by taking him to the trough, but if he doesn’t want to drink is not going to – and that’s that. Similarly, you can do your utmost to make a person share your views, yet there is a point beyond which he will not go.
‘I’ve listened to your arguments with the closest attention, Professor, and I have read carefully all the books you recommended, but I still can’t agree with you.’