Calvin on why you disagree with me (Calvin's Institutes, Battles edition: p. 1285, vol. 2)

If you set out to convince anyone by words to do something, you will think of all the arguments by which he may be drawn to your opinion and more or less constrained to obey your advice. But you have accomplished nothing unless he in turn has a keen and sharp judgment by which to weigh the validity of your arguments; unless also he is of a teachable disposition and ready to listen to teaching; unless, finally, he conceives such an opinion of your faith and prudence as may predispose him to adopt your opinion. For there are very many stubborn heads which you can never bend by reasoning.