"Good design accelerates the adoption of new ideas" says Yves Behar in this interesting video over at the 99%. Seems to be essentially the same point made by the Apostle Paul when he urges Titus to teach a lifestyle that "make(s) the teaching about God our Saviour attractive" (Titus 2:10).
Behar goes on to say that "If you want to prove that an idea has merit, don't write a book about it - go out and test it." Writing about or preaching the truth has to be in concert with living the truth or it will lack any real power. A sobering thought for all pastors.