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.
“From my very first movie, what was my concentration, my inspiration, was I didn't want to narrate something, I didn't want to tell a story. I wanted to show something, I wanted for them to make their own story from what they were seeing.”