You want a lesson? I'll give you a lesson. How about a geography lesson? My father's from Puerto Rico. My mother's from El Salvador. And neither one of those is Mexico.
What convinces is conviction. Believe in the argument you're advancing. If you don't you're as good as dead. The other person will sense that something isn't there, and no chain of reasoning, no matter how logical or elegant or brilliant, will win your case for you.