I'm in the process of intensely studying Mormon 8-9, Moroni's somber conclusion to his father's book.
In the opening of chapter 8, Moroni says the following about the current state of affairs in the land:
8 ...And behold also, the Lamanites are at war one with another; and the whole face of this land is one continual round of murder and bloodshed; and no one knoweth the end of the war.
I wonder if Moroni is intentionally contrasting "one continual round of murder and bloodshed" with the Lord's course being "one eternal round." We find the latter phrase three times in the Book of Mormon, each time immediately preceding a warning about being cut off or remaining in filthiness:
20 I perceive that it has been made known unto you, by the testimony of his word, that he cannot walk in crooked paths; neither doth he vary from that which he hath said; neither hath he a shadow of turning from the right to the left, or from that which is right to that which is wrong; therefore, his course is one eternal round.
21 And he doth not dwell in unholy temples; neither can filthiness or anything which is unclean be received into the kingdom of God; therefore I say unto you the time shall come, yea, and it shall be at the last day, that he who is filthy shall remain in his filthiness. (Alma 7)
12 And it may suffice if I only say they are preserved for a wise purpose, which purpose is known unto God; for he doth counsel in wisdom over all his works, and his paths are straight, and his course is one eternal round.
13 O remember, remember, my son Helaman, how strict are the commandments of God. And he said: If ye will keep my commandments ye shall prosper in the land—but if ye keep not his commandments ye shall be cut off from his presence. (Alma 37)
18 For he is the same yesterday, today, and forever; and the way is prepared for all men from the foundation of the world, if it so be that they repent and come unto him.
19 For he that diligently seeketh shall find; and the mysteries of God shall be unfolded unto them, by the power of the Holy Ghost, as well in these times as in times of old, and as well in times of old as in times to come; wherefore, the course of the Lord is one eternal round.
20 Therefore remember, O man, for all thy doings thou shalt be brought into judgment.
21 Wherefore, if ye have sought to do wickedly in the days of your probation, then ye are found unclean before the judgment-seat of God; and no unclean thing can dwell with God; wherefore, ye must be cast off forever. (1 Nephi 10)
Going back to Mormon 8, notice how Moroni describes war and depravity in which he finds himself:
7 And behold, the Lamanites have hunted my people, the Nephites, down from city to city and from place to place, even until they are no more; and great has been their fall; yea, great and marvelous is the destruction of my people, the Nephites.
8 And behold, it is the hand of the Lord which hath done it. And behold also, the Lamanites are at war one with another; and the whole face of this land is one continual round of murder and bloodshed; and no one knoweth the end of the war. (Moroni 8)
"...it is the hand of the Lord which hath done it." In other words, Moroni is openly aware that the Nephites' fall came as a result of the violation of their covenant.
In the next post, We'll look at the phrase in purple above and show how it also serves an important role in pointing our minds to three key aspects of the Nephite's history and covenants which justify their downfall.