You may lead a horse to the water, but you cannot make him drink

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.’