Best-selling author J. I. Packer, one of the most influential evangelicals in America today, has put together the new, Christian classic on the basics of the faith. Serving to unify the church worldwide on the grounds we can all agree on, Packer calls us to hold on to the core of Christianity. Packer's newest book also helps us guard against liberalism by pushing Christians to know their faith so they can explain it to inquirers and sustain it against skeptics. Here is a call to a discipleship in mere Christianity--the business of taking God seriously.