Do I need to buy the book that goes alongside the course?

For The Prayer Course, we’d highly recommend purchasing How to Pray by Pete Greig as a complementary resource. For The Prayer Course II: Unanswered Prayer, we’d highly recommend purchasing God on Mute by Pete Greig as a complementary resource. 

This is because there will be additional material in the book that will supplement the course content, but it is not essential to purchase the book in order to understand the content of the course