Who is she that looketh forth as the morning, fair as the moon, clear as the sun, and terrible as an army with banners? Song of Solomon 6:10
In the verse above, Solomon is making comparisons to his bride's beauty. It is interesting that this question is answered in modern scripture D&C 109:73:
That thy church [Zion] may come forth out of the wilderness of darkness, and shine forth fair as the moon, clear as the sun, and terrible as an army with banners; .
A cultural and Hebraic perspective on this verse adds additional insight. In Everyman's Bible Commentary, Paige Patterson tells us:
"Solomon asked, "Who is this that looks forth as the dawn or the morning?" "Looks forth" is literally "to bend forward" and hence "to look down," like the rays of the sun that look down on the earth in the early hours of the day. The reference is to her radiance. "Fair as the moon" (beautiful) and as "clear" or pure "as the sun." "Terrible" (Hebrew: 'ayom) also means "formidable"- an influence that must be exercised with responsibility."(pgs.95-96,99)
In terms of Zion being the Lord's Church and therefore his Bride, I love the consistency of this verse:
From these three verses combined, we learn that the Lord's Church (Zion) is not only radiant, beautiful, and pure, but that she has a formidable power that causes the wicked to flee. It is the shining power of goodness and purity.