You can't convince anyone of anything. You can only give them the right information, so that they convince themselves.
Eben PaganA salaried job trains us to be "right" all the time and induces an entitlement mentality. This is because we get paid the same amount no matter what work we are producing, and we begin to see this is fair and right, and we begin being trained to think we are right all the time. When we become salespeople and marketers, we have to leave all of that behind.
Eben Pagan