This book was published in 2013 but it is far from out of date. It carries endorsements from R. Scott Clark and Ian Hamilton. Tim Keller has been invited to two conferences in England this year and he continues to exert a significant influence upon evangelical thinking in the English speaking world.
Though I am one of the contributors in this book (my essay is called "Losing the Dance: is the 'divine dance' a good explanation of the Trinity?"), I am unashamed in commending this book to as wide an audience as possible. Kellerite contextual approaches to the church, theology, preaching and worship abound. The church must be guarded against unbalanced doctrine. This does not mean that all that Tim Keller does is wrong, however there are significant flaws in his theological system.
Our supreme guide in the church is Holy Scripture and the right interpretation. Listen to Acts 8:30-31 'So Philip ran to him and heard him reading Isaiah the prophet and asked, “Do you understand what you are reading?” And he said, “How can I, unless someone guides me?” And he invited Philip to come up and sit with him'.
There are two key questions in this passage.
1). Do you understand what you are reading?
2). How can I unless someone guides me?
Our source of authority is Holy Scripture but we need reliable teachers to guide us. The book "Engaging with Keller" strengthens the church to engage with doctrine. For the first essay by Iain D. Campbell called "Keller on 'Rebranding' the doctrine of Sin", the book pays for itself.
Buy it and pass it on to others.