... please take an hour to listen to this discussion of it (link). I'm not going to endorse every last iota of what is said in the video, and quite frankly the men in the video wouldn't be happy if I did. Nevertheless, as Steve Hays has already observed, there is a lot of wisdom in the video, notwithstanding the fact that the men themselves (judged by the world's standards) do not appear to be highly educated.
Even if you are not called to open air preaching, a lot of the principles described are also applicable to blogging, on-line forums, and like virtual interactions.
-TurretinFan