This book focuses on a neglected area of New Testament studies--the function of prayer across the Johannine literature. By building on the author's previous work, Prayer in John's Farewell Discourse, this book takes another step forward by exploring how prayer in the Farewell Discourse compares to prayer in 1 John, 3 John, and Revelation. It also seeks to discern how prayer is linked to the ethical behaviors of Johannine disciples, their missional success as they carry forth the mission of God in the world, and the eschatological impulse of calling for Jesus to come again in order to complete his work in the world. As a bonus, the final chapter highlights key elements of Johannine prayer that are relevant to the contemporary reader who approaches the Scriptures not merely as ancient documents to be read and interpreted but as timeless truths that are to be applied and obeyed.