Although Sweet is notoriously scattered (I purchased the book based off of John Stackhouse's unique critique-including recommendation published in the book, where he states, "It sometimes, and maddeningly, oversimplifies and underexplains."), I really enjoyed reading "Nudge". The basic premise of evangelism-as-paying-attention (nudging people towards what God is up to) may sound at first a bit fluffy and, to some, a cop-out of the hard work of "real kingdom work" (like preaching to your neighbours and handing out tracts). However, Sweet's description of how we pay attention through the use of our senses is profoundly practical and appealing when it comes to a "how-to" model of evangelism.
He argues that people of faith should know where to find Jesus through their senses, God-given functions that help us discern the God-signs (semiotics) in the world. Blending a Celtic perspective on Spiritual awareness (Pause, Presence, Picture, Ponder, Promise) with the 5 senses (Hear, Taste, See, Touch, Smell), he suggests that "there is always more and there is always meaning", and this applies particularly to people. We see this in what Sweet calls the 5 "God-guarantees": (1) Human beings are created in the image of God. (2) God is already present in that person's life in the form of some burning bush. (3) The best things about that person are blessings from God. (4) The worst things about that person are arenas for redemption. (5) People are hungry for encouragement and love. Sweet is suggesting that we use semiotics to help bring attention to the God-guarantees in people's lives.
I find it hard to get through a Sweet book without underlining something. He must be a voracious reader, and must have an impeccable memory, or a great system of remembering concepts and ideas. What he puts into a single page (again, what often feels like random bits of information leaving you wondering what his thesis is) is more a work of art than a linear argument. There are stories after stories that are unique to him, there are illustrations that span the centuries, and it will take you a good 1/2 hour just to read through all the interesting tidbits in his notes found at the back of the book. Footnotes are Sweet's best friends. You get the sense that he's always got more to say on, well, pretty much everything. Which I think would make him a very interesting person to chat with over a cup of coffee.