Jacob has spoken mostly of the benefits of resurrection, that the spirit and the body will be united. That is only one of the two “monsters” of which he spoke. It is the release from death. Now, he must explain the conquest over hell. To do this, Jacob creates a problem. With a resurrection, both the bodies of the wicked and the good are risen and reunited with their bodies. However, that reuniting brings back the remembrance of mortality, but a remembrance that has now become perfect, perhaps because it is in the celestial realm.
This perfect knowledge of all our guilt and uncleanness, if we are wicked, or our goodness, if we are righteous, must both come before the Holy One of Israel to be judged. In Jacob’s discussion, that judgment will be the agent of conquering the death of the spirit.