“If you can once engage people's pride, love, pity, ambition (or whatever is their prevailing passion) on your side, you need not fear what their reason can do against you.”
-Lord Chesterfield
I believe Lord Chesterfield is saying if you can catch and use peoples passions whatever it might be, on your side of the argument you will win the argument no matter the reasoning. I agree his point is valid to some point. You should also be well spoken and know which emotion or emotions will catch the reader or hearers attention.
Adolph Hitler, A German politician was able to get the peoples attention using their ambition to be their own people without other people invading their space, also using pride in them selves being a perfect supreme people and using love of their country, themselves, their family, and the people. Gaining the peoples favor they put Hitler in office after Hitler loosing his run for president of Germany being of the Nazi party.
He used their strong emotions to completely throw out their reasoning, putting many Jews in harms way killing many women and children. Hitler was a very well spoken politician. He knew his way around words and what would catch the emotional state of the people at the time, Ultimately giving him power and control over the Germans. On the other hand reasoning can also be very powerful if you have an audience that is not easily overtake by emotion. That will stop and think critically about their actions, what is being said and what they are saying
In conclusion if you know someone’s passion/passions that are heavy you may be able to use those emotions in a well-spoken argument. The ability to overrule the audiences reasoning is imminent proven previously by Adolph Hitler