Collins's unique competency in this doctrinal domain is evident on every page... the review of literature alone makes this book a key reference point for any serious study of the doctrine.

- Religious Studies Review, Vol. 37, Issue 4,

'If you want to know why this understanding of the Trinity has come to dominate certain parts of English systematic theology [...] then read this excellent book ... It is both scholarly and comprehensive ... This provides an invaluable introduction to this most central, distinctive and perplexing doctrine of the Christian faith.' Baptist Times, March 2009

"The book presents a wide range of the theological positions that have been taken over the centuries in talking about God as Trinity. It charts answers to the central questions of Trinitarian theology, such as what personhood might mean in God, how those Persons are related, and what communion in God might say about communion in the Church ...With an extensive bibliography and suggestions for further reading at the end of each chapter, this is a useful, if not indispensable, guide. It is not for the perplexed, however, but rather for the already reasonably well-instructed reader who wants to take things further."Church Times, April 2009