Concerning the Lord's second coming:

"They come from a far country, from the end of heaven, yea, the Lord, and the weapons of his indignation, to destroy the whole land. Howl ye, for the day of the Lord is at hand; it shall come as a destruction from the Almighty. Therefore shall all hands be faint, every man's heart shall melt; And they shall be afraid; pangs and sorrows shall take hold of them; they shall be amazed one at another; their faces shall be as flames. Behold, the day of the Lord cometh, cruel, both with wrath and fierce anger, to lay the land desolate; and he shall destroy the sinners thereof out of it."
- 2 Nephi 23:5-9.

"For the time soon cometh that the fulness of the wrath of God shall be poured out upon all the children of men; for he will not suffer that the wicked shall destroy the righteous. Wherefore, he will preserve the righteous by his power, even if it so be that the fulness of his wrath must come, and the righteous be preserved, even unto the destruction of their enemies by fire. Wherefore, the righteous need not fear; for thus saith the prophet, they shall be saved, even if it so be as by fire."
- 1 Nephi 22:16-17.

When the Lord comes, there will be no doubt who He is.