(Isa. 14:32)
Isaiah also knew that ultimately the whole Philistine coast would be occupied by a righteous people who would say: “The Lord hath founded Zion, and the poor of his people shall trust in it.” The word “Zion” refers to a place and a condition. Modern prophets have been told that the place called Zion is North and South America, to which Isaiah referred frequently in his writings (Smith, Teachings, 362). However, “Zion” as a condition can be anywhere. As the Lord has declared, “This is Zion—the pure in heart” (D&C 97:21). Isaiah knew that ultimately Palestine would belong to the pure in heart.
(W. Cleon Skousen, Isaiah Speaks to Modern Times [Salt Lake City: Ensign Publishing Co., 1984], 286.)
Why is Isaiah hard to understand? (Nephi gives us the answer in 2 Ne. 25:1–5.)