D&C 93

 The Lord explained - 

"All truth is independent in that sphere in which God has placed it, to act for itself, as all intelligence also; otherwise there is no existence.

31 Behold, here is the agency of man, and here is the condemnation of man; because that which was from the beginning is plainly manifest unto them, and they receive not the light."  (Doctrine and Covenants 93:30–31)

Eternal things all come down to agency for - 

"Light and truth forsake that evil one."  (Doctrine and Covenants 93:37)

That is the challenge!