“Elder James E. Talmage wrote in the first edition of the Church-published Articles of Faith, ‘Advancement from grade to grade within any kingdom, and from kingdom to kingdom, will be provided for. Eternity is progression.’ He later elaborated, no man will be detained in the lower regions ‘longer than is necessary to bring him to a fitness for something better. When he reaches that stage the doors will open and there will be rejoicing among the hosts who welcome him into a better state.’”

Source: "The Christ Who Heals"