This is a remarkable and moving book, as it brings the necessity and beauty of the doctrine of the Trinity to life. Make no mistake, the Trinity is not some dusty and irrelevant doctrine that we can safely ignore; rather, it describes God as he is, and makes real that most common of throwaway comments: God is love. As Reeves explains, any idea of “God as love” is incoherent if we do not understand him as a trinity: “ 'God is love': those three words could hardly be more bouncy. They seem lively, lovely, and as warming as a crackling fire. But 'God is a Trinity'? No, hardly the same effect: that just sounds cold and stodgy. All quite understandable, but the aim of this book is to stop the madness. Yes, the Trinity can be presented as a fusty and irrelevant dogma, but the truth is that God is love because God is a Trinity. This book, then, will simply be about growing in our enjoyment of God and seeing how God's triune being makes all his ways beautiful…it is only when you grasp what it means for God to be a Trinity that you really sense the beauty, the overflowing kindness, the heart-grabbing loveliness of God.”
Reeves unpacks this idea by examining the importance of understanding God as Trinity at four crucial points: before creation, in creation, in salvation, and in the Christian life.
As regards the first, a common question is, ‘What was God doing before creation?’ Far from being lonely or incomplete, the persons of the Trinity have loved one another from all eternity: “Before he ever created, before he ever ruled the world, before anything else, this God was a Father loving his Son…at bottom, he is not creator, ruler, or even 'God' in some abstract sense: he is the Father, loving and giving life to his Son in the fellowship of the Spirit. A God who is in himself love, who before all things could never be anything but love. Having such a God happily changes everything.”
Moving to consider creation, Reeves explains that, “The very nature of the triune God is to be effusive, ebullient and bountiful; the Father rejoices to have another beside him, and he finds his very self in pouring out his love. Creation is about the spreading, the diffusion, the outward explosion of that love. This God is the very opposite of greedy, hungry, selfish emptiness; in his self-giving, he naturally pours forth life and goodness. He is, then, the source of all that is good, and that means he is not the sort of God who would call people to himself away from happiness in good things. Goodness and ultimate happiness are to be found with him, not apart from him…And not only is God's joyful, abundant, spreading goodness the very reason for creation; the love and goodness of the triune God is the source of all love and goodness…Indeed, in the triune God is the love behind all love, the life behind all life, the music behind all music, the beauty behind all beauty and the joy behind all joy. In other words, in the triune God is a God we can heartily enjoy and enjoy in and through his creation.”
In salvation, “the Father sent his Son to make himself known - meaning, not that he wanted simply to download some information about himself, but that the love the Father eternally had for the Son might be in those who believe in him, and that we might enjoy the Son as the Father always has. Here, then, is a salvation no single-person God could offer even if they wanted to: the Father so delights in his eternal love for the Son that he desires to share it with all who will believe.” However, our problem is that in ourselves we want nothing to do with this, as Reeves explains: “like Adam and Eve, our hearts are turned from the Lord. Naturally, we love and desire other things - ourselves, especially - and not him who is the source of life. That is a real problem, for we are made to follow our hearts, to do what we want. As Adam and Eve followed their hearts' desires when they first sinned, so we continue. 'In his heart a man plans his course' (Proverbs 16:9). But if we do not want - if our hearts do not desire the Lord of life, then we will never choose him, and so we must remain prisoners of death.” This problem showcases the need for the trinitarian work of salvation that is proclaimed in the gospel: “The Spirit is about drawing us into the divine life. The Father has eternally delighted in the Son through the Spirit, and the Son in the Father; the Spirit's work in giving us new life, then, is nothing less than bringing us to share in their mutual delight.”
All of this naturally leads to consideration of the Christian life: “My new life began when the Spirit first opened my eyes and won my heart to Christ. Then, for the first time, I began to enjoy and love Christ as the Father has always done. And through Christ, for the first time, I began to enjoy and love the Father as the Son has always done. That was how it started, and that is how the new life goes on: by revealing the beauty, love, glory and kindness of Christ to me, the Spirit kindles in me an ever deeper and more sincere love for God. And as he stirs me to think ever more on Christ, he makes me more and more God-like: less self-obsessed and more Christ-obsessed…Who could ever prefer the 'cleaner, leaner' idea of a single-person God? For, strip down God and make him lean, and you must strip down his salvation and make it mean. Instead of a life bursting with love, joy and fellowship, all you will be left with is the watery gruel of religion. Instead of a loving Father, a distant potentate; instead of fellowship, contract. No security in the beloved Son, no heart-change, no joy in God could that spirit bring. Far, far from theological clutter, God's being Father, Son and Spirit is just what makes the Christian life beautiful.”
Our response can only be one of praise and worship of such an inestimably good God: “So the glory of God is like radiant light, shining out, enlightening and giving life. And that is what the innermost being and weight of God is like: he is a sun of light, life and warmth, always shining out. As the Father gives out life and being to the Son, as the Father and the Son breathe out the Spirit, so the Spirit breathes out life into the world. The glory of this God is radiant and outgoing. As the sun gives of its own light and heat, so this God glories in giving himself…For his glory is not about taking but giving…This is seen most vividly and beautifully in the person of Jesus, who “is the glory of his Father, shining out from the Father and perfectly enlightening us to see what the Father is really like. And now Jesus himself is to be glorified. That is, we are now going to see his innermost being and weight displayed. What does it look like? A seed, dying to bear fruit. For he was speaking of his death. Astonishingly, the moment when Jesus finally reaches the deepest point of his humiliation, at the cross, is the moment when he is glorified and most clearly seen for who he is. On the cross we see the glorification of the glory of God, the deepest revelation of the very heart of God - and it is all about laying down his own life to give life, to bear fruit…Here is a glory no other God would want. Other gods need worship and service and sustenance. But this God needs nothing. He has life in himself - and so much so that he is brimming over. His glory is inestimably good, overflowing, self-giving.”
This really is a wonderful little book, and should be a shot in the arm of the faith of any Christian believer, to wonder at and take confidence in the unique goodness and beauty of the God we worship. And as he concludes, the stakes are high: “What is your Christian life like? What is the shape of your gospel, your faith? In the end, it will all depend on what you think God is like. Who God is drives everything. So, what is the human problem? Is it merely that we have strayed from a moral code? Or is it something worse: that we have strayed from him? What is salvation? Is it merely that we are brought back as law-abiding citizens? Or is it something better: that we are brought back as beloved children? What is the Christian life about? Mere behaviour? Or something deeper: enjoying God? And then there's what our churches are like, our marriages, our relationships, our mission: all are moulded in the deepest way by what we think of God.”