In the pre-mortal world there was a plan put forward by God the Father that we now call the Plan of Salvation. Lucifer responded to the plan with a counter offer. His counter offer masqueraded as an acceptance, it contained limits and changes to the plan, and was geared to his personal benefit.
Lucifer is the archetype of an non-consecrated heart.
The Law of Consecration is the law of the Celestial Kingdom. If we wish to inherit a celestial glory we need to start demonstrating that we can live this law.
We follow Satan’s example when in our lives we wish to have, or attempt to negotiate a change from the plan. Before this world was created, certain rules were set in place that we must all abide by, that we trust will bring certain results.(1)
When we refuse to live by these rules we attempt to institute our own laws. As we become the instituter of new laws, we think to change the rules in opposition to God’s will. This is called becoming a law unto ourselves. The Plan of Salvation is the only way to Salvation and Sanctification.
“That [whoever] which breaketh a law, and abideth not by law, but seeketh to become a law unto itself [themselves], and willeth to abide in sin, and altogether abideth in sin, cannot be sanctified by law, neither by mercy, justice, nor judgment. Therefore, they must remain filthy still.”(2) (Doctrine and Covenants 88:35)
If someone in this life decides they don’t want the saving ordinance of baptism for example (assuming it has been properly presented to them), thinking that they have some unique relationship with God, and they can have the blessing of salvation, and reject the ordinances, they seek to become a law unto themselves. Thinking they have carved out some special rules for themselves, and that God will have to take them as they come. What they will find is that they will either repent, or be cast off to outer darkness.
A consecrated heart is born of the understanding that there is not more than one plan, and that any counter offer is a rejection of the plan. A consecrated heart doesn’t resist God at some point of opposition (The trials of this world) and in effect say “this is as far as I go” as though they can stop the plan from working upon them. In the throws of opposition, a consecrated heart seeks strength, relief, healing, enlightenment, sanctification, patience, and the determination to endure to the end. A sanctified heart clings to the covenants, ordinances, and the knowledge of the plan.
The temple is where we receive the covenant of consecration.
(1) “There is a law, irrevocably decreed in heaven before the foundations of this world, upon which all blessings are predicated— And when we obtain any blessing from God, it is by obedience to that law upon which it is predicated.” Doctrine and Covenants 130:20-21.
(2) These people can’t be sanctified by law because they break the laws. They can’t be sanctified by mercy because they reject Christ and His mercy. Justice would condem them. They can’t be sanctified by judgment because they will be judged worthy of outer darkness, being filthy still.