The Ripple Effect is a devotional study of one of the best-loved psalms of David. Breaking the psalm down into sections, or chapters, the author examines the verses and expounds on their meanings and effects. He includes, too, some of his own writings connected with the psalm.

Robert Simpson began to serve God at a tender age. From a Christian bookshop worker in New Zealand to a literature ministry in the wilds of Papua New Guinea, to working with a publisher of legal books in London, and later becoming an ordained minister in Australia with his own parish, he absorbed and shared God's Word. After suffering a deep clinical depression, and electro-convulsive treatment, followed by a severe stroke, he learned again to trust, to speak, read, and write. This gave him plenty of time to reflect further on the Bible, and The Ripple Effect flows from all of this, a vivid and inspirational insight into both the man and the minister.