If we aren't happy, of what use is the gospel, the Church and its organizations, programs, and the way of life it espouses? Moroni stresses the importance of being happy during this phase of our eternal existence by describing the judgment: "And then cometh the judgment of the Holy One upon them; and then cometh the time that he that is filthy shall be filthy still; and he that is righteous shall be righteous still; he that is happy shall be happy still; and he that is unhappy shall be unhappy still." 

Elder Marlin K. Jensen