---&---
A couple days ago I listened to the Zombies' New World album, and I noticed two things.
"Nights on Fire"
I'm not fully convinced of this myself, but I think the line "Only believe and the door will open wide" might be a reference to the Bible, specifically "Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you. For everyone who asks receives, and the one who seeks finds, and to the one who knocks it will be opened" (Matthew 7:7-8). A couple of the other songs mention Heaven (although perhaps not in a religious sense), which seems to strengthen the possibility of this being an intentional Biblical reference.
Some more things I noticed about Zombies songs while doing Collection Audit."Knowing You"
In the line "Facing up to every day now, I will never be alone" there's a harmony part for "be alone," so the musical arrangement mirrors the lyric. The speaker/singer says that he won't be alone, and there's an-other voice there to demonstrate that.