Andrew Billings said this quote

“ This book is dedicated to the much needed establishing of greater unity in the wider body of Christ. It is dedicated to agreement with the prayer that Jesus prayed:“I do not pray for these alone, but also for those who will believe in Me through their word; that they all may be one, as You, Father, are in Me, and I in You; that they also may be one in Us, that the world may believe that You sent Me. And the glory which You gave Me I have given them, that they may be one just as We are one:”John 17:20-22 NKJV ”