Book 3 of The Way to Life series explains that the New Testament letters were not meant as teaching tools for the masses, but for strengthening believers, that is, those that already have the Holy Spirit. This book reveals how to apply the examples of Christ shown in the Old Testament, specifically, how to spiritually live "in" Christ. This book reveals in the New Testament how "Christians" are to actually live the Christian life and grow in the Spirit and mature in faith. Note that the letters of the New Testament were chosen to encourage, guide, and provide a progressive lesson series to assist people as they grow to spiritual maturity (become capable of willingly doing God's will). This book helps make this concept clear and shows how God's Plan for Life is accomplished in believers.