‘The power of religion and godliness lives, thrives, or dies, as closet prayer lives, thrives, or dies.’ This was the deeply held conviction of Thomas Brooks. As a pastor who knew his people well, he feared that many Christians did not understand the ‘necessity, excellency, and usefulness’ of private prayer, and that many lived in ‘too great a neglect of this indispensable duty.’ Focusing on our Lord’s words about ‘closet prayer’ in Matthew 6:6, Brooks supplies us with a masterful treatment of a vitally important aspect of the Christian’s life. His aim is intensely practical: ‘to preserve and keep up the power of religion and godliness both in men’s houses, hearts, and lives.’