This song is written based upon this scripture.
Jesus to His bride (the church)
For the mountains shall depart, and the hills be removed; but my kindness shall not depart from thee, neither shall the covenant of my peace be removed, saith the LORD that hath mercy on thee.
The writer of Unfailing Love, Jimmy Needham fits this scripture in to coincide his relationship with his wife…he knows that he must love his wife as Christ loves the church. (Ephesians 5:25)
I just love this song!! Check it out!