1 Nephi 7:13

And if it so be that we are faithful in him, we shall obtain the land of promise; and ye shall know at some future period, that the word of the Lord shall be fulfilled, concerning the destruction of Jerusalem; for all things which the Lord hath spoken concerning the destruction of Jerusalem, must be fulfilled.

If we have faith in him, we will get the promised land. You will know someday that the Lord’s word about Jerusalem being destroyed will come true. Everything the Lord said about Jerusalem’s destruction must happen.

“If we stay faithful, we’ll get the promised land. And someday you’ll see that everything the Lord said about Jerusalem’s destruction will come true—every word of it.”