It’s large (9.4 x 7.5 x 1.2 inches) and long (400 pp.).
The book is a strategic manual for developing a church’s theological vision. I read the introduction carefully and read the rest more quickly. It’s obvious that Keller has thought deeply about theological vision for a long time.
This graphic shows how important theological vision is (p. 19):
(Tim Keller drafted TGC’s theological vision for ministry.)