He will do what he can, consistent with his justice, to save those who will be saved.
I believe this caveat to mean that once the soul (after death) has the choice to accept or reject the posthumous baptism, confirmation into the LDS church and temple ordinances performed by proxy in its name, if the soul then rejects these acts, the soul will not be allowed into the Celestial kingdom, but must remain in the lower kingdom.
Ahhh...more fiction.