For some Christians, God the Holy Spirit is something of a mystery, and they are not too sure what to say about him. Others speak with confidence and enthusiasm about him, challenging us to be ‘filled with the Spirit’, or to live a ‘Spirit–filled life’. As a result, the work of the Spirit has sometimes been controversial. Graham Beynon looks at the main New Testament passages in which the Spirit’s work is described. With freshness and clarity, he builds a picture of what the Holy Spirit does, and hence what experiencing him in our lives should look like.