And I will make your battlements of rubies, and your gates of fiery glowing stones, and all your boundaries of delightsome stones.

Isaiah 54:11-

Consider, then, the glowing description of “Jerusalem above.” The precious stones on the gates, the costly “hard mortar,” the foundations, and even the boundaries suggest, as one reference work notes, “beauty, magnificence, purity, strength, and solidity.” What would lead anointed Christians to such a secure and blessed condition?

Isaiah 54:12 mentions “boundaries of delightsome stones.” Since 1919, Jehovah has given the anointed an ever clearer understanding of the boundaries​—the lines of spiritual demarcation—​setting them apart from false religion and ungodly elements of the world. (Ezekiel 44:23; John 17:14; James 1:27) They are thus set apart as God’s own people.​—1 Peter 2:9.