Let us here observe, that a religion that does not require the sacrifice of all things, never has power sufficient to produce the faith necessary unto life and salvation.
Joseph Smith, Jr.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. . . . All beings who have bodies have power over those who have not.
Joseph Smith, Jr.God himself, finding he was in the midst of spirits and glory, because he was more intelligent, saw proper to institute laws whereby the rest could have a privilege to advance like himself. The relationship we have with God places us in a situation to advance in knowledge. He has power to institute laws to instruct the weaker intelligences, that they may be exalted with Himself, so that they might have one glory upon another, and all that knowledge, power, glory, and intelligence, which is requisite in order to save them in the world of spirits. (King Follett Discourse)
Joseph Smith, Jr.