Kelly Burton has a post here entitled, "Sources of Application." There is some helpful information in the short post but I am not crazy about the title. The source of application should be grounded in the text at hand. As such there are not other "sources." It doesn't do much good if you nail the interpretation, excel in the explanation, and then go to another planet for the application. Those who hear our messages need to be able to see how one moves from understanding the text to applying the text. If your application does not derive from the text then who do you need the text at all.