I can say with regard to parting with our friends, and going ourselves, that I have been near enough to understand eternity so that I have had to exercise a great deal more faith to desire to live than I ever exercised in my whole life to live. The brightness and glory of the next apartment is inexpressible. It is not encumbered so that when we advance in years we have to be stubbing along and be careful lest we fall down. We see our youth, even, frequently stubbing their toes and falling down. But yonder, how different! They move with ease and like lightning. If we want to visit Jerusalem, or this, that, or the other place—and I presume we will be permitted if we desire—there we are, looking at its streets. If we want to behold Jerusalem as it was in the days of the Savior; or if we want to see the Garden of Eden as it was when created, there we are, and we see it as it existed spiritually, for it was created first spiritually and then temporally, and spiritually it still remains. And when there we may behold the earth as at the dawn of creation, or we may visit any city we please that exists upon its surface. If we wish to understand how they are living here on these western islands, or in China, we are there; in fact, we are like the light of the morning. … God has revealed some little things, with regard to his movements and power, and the operation and motion of the lightning furnish a fine illustration of the ability of the Almighty DBY, 380.
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If we are faithful to our religion, when we go into the spirit world, the fallen spirits—Lucifer and the third part of the heavenly hosts that came with him, and the spirits of wicked men who have dwelt upon this earth, the whole of them combined will have no influence over our spirits. Is not that an advantage? Yes. All the rest of the children of men are more or less subject to them, and they are subject to them as they were while here in the flesh (DBY, 379).
via LDS.org – Melchizedek Priesthood Chapter Detail – The Spirit World.