Mein Kampf. Don't be inspired. Not really because of who wrote it and such. I mean it's pure and utter trash even if I put the ideology aside.
Discussion
Because I like to know what people I don't agree with actually believe. Reading it in their own words is a really good way to understand where they are coming from.
It's much easier to convince someone to abandon a flawed belief, once you understand why they had it in the first place.