The doctrine of deification came under challenge during the Reformation. Likewise, Orthodox Christians have sometimes charged that Roman Catholic teachings on deification lack coherence.

"That Christians share in the very divine life of the Trinity is one of the most exciting and awe inspiring mysteries of the Christian faith. Dr. Daniel Keating has written a concise and readable theological introduction to this marvelous Christian doctrine... One finishes reading this book rejoicing in the knowledge that one is a Christian." -Thomas G. Weinandy, O.F.M.