“The treasure house of happiness is unlocked to those who live the gospel of Jesus Christ in its purity and simplicity. . . . The assurance of supreme happiness, the certainty of a successful life here and of exaltation and eternal life hereafter, come to those who plan to live their lives in complete harmony with the gospel of Jesus Christ---and then consistently follow the course they have set” (Teachings of Presidents of the Church: Spencer W. Kimball, p. 6-7)..