Jesus identified the great and first commandment as loving God with all of one’s heart, soul, and mind (Matt. 22:37–38), and the disciple’s first priority as seeking His kingdom and His righteousness (Matt. 6:33). Paul the Apostle throughout his letters presented these great principles as the essence of true discipleship and reflected them in his own life. The “spiritual man” is the one who “walks by the Spirit” (Gal. 5:16), is a “servant of righteousness” (Rom. 6:17–19), has been “crucified with Christ” (Gal. 2:20)—in short, one who possesses the “mind of Christ” (Phil. 2:5). From Paul we learn that our highest aspiration in this life is to “know Christ,” to “gain Christ,” and to be found “in Him” (Phil. 3:8–9). Surely there is no greater goal for the Christian. The theme for this year has been chosen because it addresses the need that we all have as Christ’s disciples to be “spiritual” people in the true and scriptural sense of the term. The lessons are based primarily on various passages from Paul’s epistles. Fifteen capable and devoted preachers of the gospel from across the nation prepared these lessons and offer them in this volume.