The sheep symbolize those of the celestial glory.
The goats symbolize everyone else. Therefore, even those of the terrestrial glory will experience the “everlasting fire” and “everlasting punishment.”
“O the wisdom of God, his mercy and grace! For behold, if the flesh should rise no more our spirits must become subject to that angel who fell from before the presence of the Eternal God, and became the devil, to rise no more. And our spirits must have become like unto him, and we become devils, angels to a devil, to be shut out from the presence of our God, and to remain with the father of lies, in misery, like unto himself” (2 Nephi 9:8-9).
“And assuredly, as the Lord liveth, for the Lord God hath spoken it, and it is his eternal word, which cannot pass away, that they who are righteous shall be righteous still, and they who are filthy shall be filthy still; wherefore, they who are filthy are the devil and his angels; and they shall go away into everlasting fire, prepared for them; and their torment is as a lake of fire and brimstone, whose flame ascendeth up forever and ever and has no end” (2 Nephi 9:16).
“O my brethren, hearken unto my words; arouse the faculties of your souls; shake yourselves that ye may awake from the slumber of death; and loose yourselves from the pains of hell that ye may not become angels to the devil, to be cast into that lake of fire and brimstone which is the second death” (Jacob 3:11).
There are different categories of devil’s angels
“For we wrestle not against flesh and blood, but against principalities [archē], against powers [exousia], against the rulers [kosmokratōr] of the darkness of this world, against spiritual wickedness in high [epouranios] places” (Ephesians 6:12).
Archē has been translated as “principalities” or “magistrates” (“the first person who commences,” “the leader”). Exousia has been translated as “powers” or “authorities.”
This implies that there is some structure to the forces of the adversary.
The use of the word epouranios is interesting, since it is also translated as “heavenly.” “Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly [epouranios] places” (Ephesians 1:20-1).
Therefore, spiritual wickedness is not just in places of worldly authority, but also exists in heavenly places.
The current ruler [archōn] of this world
“Wherein in time past ye walked according to the course of this world, according to the prince [archōn] of the power of the air [aēr], the spirit that now worketh in the children of disobedience” (Ephesians 2:2).
“Now is the judgment of this world: now shall the prince [archōn] of this world be cast out” (John 12:31).
“Hereafter I will not talk much with you: for the prince [archōn] of this world cometh, and hath nothing in me” (John 14:30).
“Of judgment, because the prince [archōn] of this world is judged” (John 16:11).
Archōn appears to be better translated as “ruler” than as “prince,” since nowadays a prince is generally thought of as a son of a king.
“In whom the god [theos] of this world [aiōn] hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them” (2 Corinthians 4:4).
“And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince [archōn] of the kings [basileus] of the earth” (Revelation 1:5).
In the above scripture, an archōn is superior to a king.