In this book Stuart Olyott shows that the doctrine of the Trinity is plainly taught in the Bible, and that it is the foundation for a true understanding of the Christian gospel. The book is written in straightforward language and is intended for the ordinary reader. Although it certainly shows up the error of the modern cults, its main purpose is to lead people to a better understanding of what God has revealed about Himself in His Word.
This book is an excellent starter on the doctrine of the Trinity. Dr. Olyott explained it very clearly from the Bible.
I read this book because of a visitor to my church who denied the Trinity. This has given me more Scriptural references to study and quote to those who are confused about the Trinity. Thank you, Dr. Olyott for the hard work and clear explanations.
One of the books that most clearly sets out the theology of the Trinity which helped me in my early days as a Christian to get an understanding of what it is about.
Lots of good things can be said for his short book: accessibility; humility in approaching the study; application of Trinitarian truth; careful treatment of what Scripture teaches; and the correction of common Trinitarian heresies, both unwitting and deliberate. Initially I had two concerns about the book: the lack of application and thinness on prevalent misunderstandings.
I have written a blog post, critiquing some of Olyott's points: blasphemy against the Holy Spirit, praying to God the Son, and the question of how orthodox one needs to be in order to have saving faith. In that post you will also find a link to my full length review of the book
As always, Olyott offers a wonderful example of writing about doctrine clearly, humbly, and devotionally. The aim of the whole book is to lead us to worship the triune God, and it's definitely successful in that aim. Overall, this would be a good introduction to the topic, especially the opening chapters, and the closing thoughts on historical errors and application. I found the discussions of specific issues, like eternal generation and procession, less satisfying, and I would take issue with Olyott on some issues (e.g. "Prayer to God is not to be addressed to the Lord Jesus Christ, but to the one who is distinct from him—the Father"). But good to have on the shelf for anyone with responsibility for teaching such glorious truths to others.