One of the other threads brought up "weeping and gnashing of teeth." I thought it might be interesting to discuss that topic here. Please offer your understanding of the verses that are provided.
Matthew 24: 51
51 And shall cut him asunder, and appoint him his portion with the hypocrites: there shall be weeping and gnashing of teeth.
Checking Strong's Concordance it lists the word klauthmos for weeping and brygmos for gnashing.
Klauthmos = weeping, wailing, lamentation.
Seems to be indicating that this person is unhappy. Very unhappy.
Brygmos =
1) a gnashing of teeth
a) used to denote extreme anguish and utter despair of men consigned to eternal punishment in hell
2) snarling, growling: in the sense of biting
More of the same.
And
Matthew 13: 41-42
41 The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity;
42 And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth.
Based on these two verses this seems to be a phrase used to describe the unhappiness a person feels when they are cast away from God. The first describes being appointed the same fate as the hypocrites and the second describes a fiery furnace.
Here are a few more verses.
Luke 13: 28
28 There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out.
This gnashing is done when a person sees the rewards of the prophets as they are thrust out from among them.
Acts 7: 51-54
51 Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.
52 Which of the prophets have not your fathers persecuted? and they have slain them which shewed before of the coming of the Just One; of whom ye have been now the betrayers and murderers:
53 Who have received the law by the disposition of angels, and have not kept it.
54 When they heard these things, they were cut to the heart, and they gnashed on him with their teeth.
Those who resisted the Holy Ghost and also did not keep the law gnashed when they heard the truth.
Mosiah 16: 2
1 And now, it came to pass that after Abinadi had spoken these words he stretched forth his hand and said: The time shall come when all shall see the salvation of the Lord; when every nation, kindred, tongue, and people shall see eye to eye and shall confess before God that his judgments are just.
2 And then shall the wicked be cast out, and they shall have cause to howl, and weep, and wail, and gnash their teeth; and this because they would not hearken unto the voice of the Lord; therefore the Lord redeemeth them not.
In Mosiah we see that the wicked will howl, weep, wail, and gnash because they will not be redeemed because of their wickedness. I notice that this happens after everyone sees the salvation of the Lord. Sort of a - this is what you could have had but this is what you get - kind of thing.
That should be enough for now.

Matthew 24: 51
51 And shall cut him asunder, and appoint him his portion with the hypocrites: there shall be weeping and gnashing of teeth.
Checking Strong's Concordance it lists the word klauthmos for weeping and brygmos for gnashing.
Klauthmos = weeping, wailing, lamentation.
Seems to be indicating that this person is unhappy. Very unhappy.
Brygmos =
1) a gnashing of teeth
a) used to denote extreme anguish and utter despair of men consigned to eternal punishment in hell
2) snarling, growling: in the sense of biting
More of the same.
And
Matthew 13: 41-42
41 The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity;
42 And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth.
Based on these two verses this seems to be a phrase used to describe the unhappiness a person feels when they are cast away from God. The first describes being appointed the same fate as the hypocrites and the second describes a fiery furnace.
Here are a few more verses.
Luke 13: 28
28 There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out.
This gnashing is done when a person sees the rewards of the prophets as they are thrust out from among them.
Acts 7: 51-54
51 Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.
52 Which of the prophets have not your fathers persecuted? and they have slain them which shewed before of the coming of the Just One; of whom ye have been now the betrayers and murderers:
53 Who have received the law by the disposition of angels, and have not kept it.
54 When they heard these things, they were cut to the heart, and they gnashed on him with their teeth.
Those who resisted the Holy Ghost and also did not keep the law gnashed when they heard the truth.
Mosiah 16: 2
1 And now, it came to pass that after Abinadi had spoken these words he stretched forth his hand and said: The time shall come when all shall see the salvation of the Lord; when every nation, kindred, tongue, and people shall see eye to eye and shall confess before God that his judgments are just.
2 And then shall the wicked be cast out, and they shall have cause to howl, and weep, and wail, and gnash their teeth; and this because they would not hearken unto the voice of the Lord; therefore the Lord redeemeth them not.
In Mosiah we see that the wicked will howl, weep, wail, and gnash because they will not be redeemed because of their wickedness. I notice that this happens after everyone sees the salvation of the Lord. Sort of a - this is what you could have had but this is what you get - kind of thing.
That should be enough for now.