3 Nephi 21: 15-18:
“And I will cut off the cities of thy land, and throw down all thy strongholds; And I will cut off witchcrafts out of thy land, and thou shalt have no more soothsayers; Thy graven images I will also cut off, and thy standing images out of the midst of thee, and thou shalt no more worship the works of thy hands; And I will pluck up thy groves out of the midst of thee; so will I destroy thy cities.”
Cleaning up things so that the course of wickedness comes to an end involves some highly specific purging. However, the description is not given to us so we can know what will be coming as much as it is given to us to guide our own conduct and beliefs.
“Cities will be cut off” means what? “Strongholds thrown down” refers to what? Interesting things to contemplate to be sure. But much more relevant are the warnings in what follows:
“Cut off witchcrafts” is a warning to those who engage in certain practices. What should you do to avoid being cut off as a result of being involved in “witchcraft?” What does that mean? Are only wiccans being warned by this?
Who are the “soothsayers” who are to be terminated? What constitutes “soothsaying?” Look that word up. It appears in interesting contexts. The typical example involves predictions made using means other than true prophecy. But you should look at it and ask yourself how it would apply in modern applications: in business, government, economics, weather–especially long-term weather, politics, etc.
What are “graven images?” What are “standing images?” Why are the “standing images” said to be “in the midst of thee?”
What does it mean to “worship the works of thy hands?” How can a person worship their own works?
What are the “groves” that are to be plucked up? Why are the groves also “in the midst of thee?” The ancient usage of groves involved fertility rites, sacred sexual practices, or the worship of intercourse. What modern versions of this ancient form of fertility worship would be similar to the ancient behavior as to merit being called the same thing?
What does it mean to have our “cities destroyed?” Does this have anything to do with the other prophecy that the final victory of Israel will inhabit the desolate cities of the gentiles? (Isa. 54: 3.)
Remember this is Christ speaking. This is the Redeemer, the merciful author of our salvation. Therefore, you must conclude that these direful predictions are actually based on the overall long-term best interest of those involved. They are better off, improved and advanced by these judgments. Imagine that. The wrath of God is best visited upon those who are destroyed, rather than leaving them to continue the course they are headed in. It is an interesting thing to contemplate.