Mathew 24;Joseph Smith-M1 states, "At the beginning of Millennial Era, Christ will return unto the earth.  This event will mark the end of the mortal probation of this earth.  The wicked will be removed from the earth and the righteous will be caught up in a cloud while the earth is cleansed.  While no man knows exactly when Christ will come for the second time, He has given us signs to watch for that indicate the time is drawing near."
Mosiah 16:5 states,"But remember that he that persists in his own carnal nature, and goes on in the ways of sin and rebellion against God, remaineth in his fallen state and the devil hath all power over him.  Therefore he is as though there was no redemption made, being an enemy to God; and also is the devil an enemy to God."  Verse 9 states, "Christ is the light and the life of the world; yea, a light that is endless, that can never be darkened; yea, and also a life which is endless, that there can be no more death.
This mortal life is period of probation for we are in fallen state away from Heavenly Father but, we can believe on teachings of Jesus Christ and reap good works for reward of eternal life and judgement     of unending happiness.  Because Christ has paid for our sins, we can repent often and be cleansed of our sins and start over in obeying His commandments.