Wo, to those who know this is true but put it away

In Moroni 10:26 it states, " And wo unto them who shall do these things away and die, for they die in their sins, and cannot be saved in the kingdom of God: and I speak it according to the words of Christ; and I lie not. "

I am thankful for the restored gospel as we know that the gospel will be preached to the dead in order that those who " did not do these things away " can have the chance to still accept the gospel and have the ordinances done for them to enter in the kingdom of God. ( 1 Peter 3: 19 ) 

However, I believe that what this scripture is trying to convey is the message in a quote by Bruce R. Mckonkie 

as he states:

 " There is foolishness in believing that a person can reject the gospel in this life, accept it in the next, and still inherit Celestial Glory. There are those who believe that the doctrine of salvation for the dead offers men a second chance for salvation.

 I knew a man , now deceased, not a member of the church, who was a degenerate old reprobate, who found pleasure, as he supposed, in living after the manner of the world. A cigarette dangled from his lips, alcohol stenched his breath, and profane and bawdy stories defiled his lips. His mortal status left much to be desired. " His wife was a member of the church, as faithful as she could be under the circumstances. One day she said to him, " You know the church is true why wont you be baptized? " He replied, " Of course I know the church is true, but I have no intention of changing my habits in order to join it. I prefer to live the way I do. But that doesn't worry me in the slightest. I know that as soon as I die, you will have someone go to the temple for me, and do the work and everything will be come alright in the end anyway.

There is no such thing as a second chance to gain salvation. This life is the time and day of our probation. After this day of life, which is given us to prepare for eternity, then come the the night of darkness wherein there can be no labor performed. 

For those who do not have an opportunity to believe and obey the holy word in this life, the first chance to gain salvation will come in the spirit world. if those who hear the word for the first time in the realms ahead are the kind of people who would have accepted the gospel here, had the opportunity been afforded them, they will accept it there. Salvation for the dead is for those whose first change to gain salvation is in the spirit world. 

 There is no other promise of salvation than the one recited in that revelation ( D&C 137: 7-8 ) Those who reject the gospel in this life then receive it in the spirit world go not to the Celestial Kingdom, but to the Terrestrial Kingdom." 

( The Seven Deadly Heresies , in speeches of the year 1980  BYU )