Martyn Lloyd-Jones explores the assertion of John the Baptist that Jesus would baptize with the Holy Spirit (John 1:33). The result is a classic call to submit afresh to the Spirit for power, purity and assurance, while keeping our heads in the face of pitfalls that might distract or ensnare us. 'This is vintage Lloyd-Jones. As always, timeless and timely' - R.T. Kendall, former Minister of Westminster Chapel. 'This book shows that while there is abundant life in the Spirit, the Spirit is the Spirit of truth, who always witnesses to Jesus Christ' - Hywel R. Jones, London Theological Seminary.'I welcome this new publication of the Doctor's urgent appeal to the church not to quench the Spirit. This is no age to advocate restraint; the church today does not need to be restrained, but to be aroused, to be awakened, to be filled with the Spirit of glory. I for one rejoice that his clarion call can still be heard' - Terry Virgo, Newfrontiers. 'Jesus said we will be in error if we do not know both the Scriptures and the power of God. Joy Unspeakable will help us to encounter both and so walk in truth' - Roger Forster, Ichthus Fellowship. 'Not all of Dr Lloyd-Jones' expression will convince everyone, but anyone who is spiritually alive will gain enormously from this magisterial and challenging recall to the inner realities of the true Christian life' - J.I. Packer, Regent College, Vancouver. 'An outstanding example of preaching which is both visionary and discerning because biblically balanced' - Peter Lewis, Cornerstone Evangelical Church.