"In 'The Family: A Proclamation to the World,' the First Presidency and Council of the Twelve Apostles declare that as spirit sons and daughters of God we 'accepted His plan by which His children could obtain a physical body and gain earthly experience to progress toward perfection and ultimately realize [our] divine destiny as heirs of eternal life' (“The Family: A Proclamation to the World,” Ensign, Nov. 1995, 102; or Liahona, Oct. 2004, 49). Please note the primary importance of obtaining a physical body in the process of progressing toward our divine destiny.
The Prophet Joseph Smith taught with clarity the importance of our physical bodies:
'We came to this earth that we might have a body and present it pure before God in the celestial kingdom. The great principle of happiness consists in having a body. The devil has no body, and herein is his punishment. He is pleased when he can obtain the tabernacle of man, and when cast out by the Savior he asked to go into the herd of swine, showing that he would prefer a swine’s body to having none. All beings who have bodies have power over those who have not. The devil has no power over us only as we permit him; the moment we revolt at anything which comes from God, the devil takes power.'
Our physical bodies make possible a breadth, a depth, and an intensity of experience that simply could not be obtained in our premortal estate. President Boyd K. Packer has taught, 'Our spirit and our body are combined in such a way that our body becomes an instrument of our mind and the foundation of our character.' Thus, our relationships with other people, our capacity to recognize and act in accordance with truth, and our ability to obey the principles and ordinances of the gospel of Jesus Christ are amplified through our physical bodies. In the classroom of mortality, we experience tenderness, love, kindness, happiness, sorrow, disappointment, pain, and even the challenges of physical limitations in ways that prepare us for eternity. Simply stated, there are lessons we must learn and experiences we must have, as the scriptures describe, 'according to the flesh' (see 1 Nephi 19:6; Alma 7:12–13)."