The book emphasizes this fact. If you don't actually care about the person you're trying to influence, if you aren't acting in what you believe is their best in

The book emphasizes this fact. If you don't actually care about the person you're trying to influence, if you aren't acting in what you believe is their best interest, they can tell (usually). We have marvelous words in English for this, like "smarmy" and "skeezy".