Book excerpt: Christians often know the theory of the Spirit-filled life but not the joy-filled experience. Pastor and theologian A. W. Tozer said that Christians often know nothing personally about the inner fire of a Spirit-filled life. This timely voice provides a timeless glimpse into spiritual maturity and growth. The "deeper life" is deeper only because the average Christian life is tragically and unnecessarily shallow. Tozer examines our lack of personal zeal and its causes. Why do we settle for peace of mind and material prosperity? What can we do with our fears, disappointments, and disillusionment? In The Deeper Life, Tozer demonstrates how the ancient heart-thirst felt by all of us can only be quenched by the personal presence of God Himself. We must press on to enjoy in personal inward experience the exalted privileges that are ours in Christ Jesus. We must surrender our whole beings to the power of the cross. We must die to our sins, our righteousness, and everything in which we formerly prided ourselves. We must be willing to make Christ our one supreme Lord. Tozer wants to ignite a divine fire in our souls. Readers examine their relationship to the Holy Spirit, discover the value of spiritual gifts, and follow sequential steps to living The Deeper Life.