Our Heavenly Father has given us this mortal life to enable us to become more like him . There are two major obstacles to this goal. Although the spirit continues to live on, the imperfect, mortal body dies. This physical death is overcome through the resurrection of Jesus Christ.
Resurrection is the reuniting of the spirit with a glorified, immortal body.
Because of Christ, all of us will be resurrected. The second major obstacle to our becoming like our Heavenly Father is sin. To enable us to grow, God has made us free to choose between good and evil., between obeying or disobeying him. To act against the will of God is to commit sin and become unclean. Sin leads to unhappiness in this life and after this life.