Keys of the Kingdom

I haven't found anything that connects the title Keys of the Kingdom with the songs on the album (maybe I'll find something now that I've started this project), but the title itself seems to come from the Bible.  In Matthew 16:19, Jesus tells His disciples, "I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven."