We have an enlightening definition of death in the following quotation from the Doctrine and Covenants, Section 29: 'Wherefore I the Lord God caused that he (Adam) should be cast out from the Garden of Eden, from my presence, because of his transgression, wherein he became spiritually dead, which is the first death, even that same death, which is the last death, which is spiritual, which shall be pronounced upon the wicked when I shall say Depart ye cursed'.
"It seems to me that there is a most interesting agreement here.
Banishment from the place where God lives is death.

By the operations of a natural law, a person who fails to correspond with a celestial environment dies to that environment and must go or be placed in some other, where he can function with that which is about him.

God's presence is exalted, holy, glorified.

He who is not pure, holy, glorified cannot possibly live there, is dead to that higher world.
A soul who cannot function in the celestial glory, may do so in the terrestrial glory; one who cannot function in the terrestrial, may in the telestial; and one who cannot 'abide the law' or function in the telestial must find a place of no glory.

This is inevitable--it cannot be otherwise.