Hell

Elder Dallin H. Oaks, Fundamental to Our Faith, January 2011 Ensign

"Like other Christians, we believe that when we leave this life, we go to a heaven (paradise) or a hell. But to us this two-part division of the righteous and the wicked is merely temporary while the spirits of the dead await their resurrection and Final Judgment (see Alma 40:11–14). The destinations that follow the Final Judgment are much more diverse, and they stand as evidence of the magnitude of God’s love for His children—all of them."

Alma 12:9-11
9 And now Alma began to expound these things unto him, saying: It is given unto many to ^aknow the ^bmysteries of God; nevertheless they are laid under a strict command that they shall not impart ^conly according to the portion of his word which he doth grant unto the children of men, according to the heed and diligence which they give unto him.

10 And therefore, he that will ^aharden his heart, the same receiveth the ^blesser portion of the word; and he that will ^cnot harden his heart, to him is ^dgiven the greater portion of the word, until it is given unto him to know the mysteries of God until he know them in full.

11 And they that will harden their hearts, to them is given the lesser ^aportion of the word until they ^bknow nothing concerning his mysteries; and then they are taken captive by the devil, and led by his will down to destruction. Now this is what is meant by the ^cchains of ^dhell.

As they separate themselves from God they understand less and less of the mysteries of God and have trapped themselves in their distance from God.