I came across this article today on Tullian Tchividjian's blog: The Grammar of The Gospel.
Mark Baur had mentioned this idea to me after he got back from the Desiring God conference in October. The thing that stuck out to him from Tullian's message was that "Imperatives-Indicatives=Impossibilities." This basically means that giving commands to do things, without understanding the truths behind those commands, makes carrying them out impossible. This shows up in churches all over the place. People try to preach commands of morality, missions, and evangelism but never see any results. The main problem, as far as I can see it, is that people do not understand the truths of the Gospel so they do not really understand why they would want to do these things.
In this short article, Tullian quotes Sinclair Ferguson putting this is a positive light. "In the gospel, the structure of the grammar is always indicative gives rise to imperative..." This is very helpful to know.