Lyric discussion by cbehrens 

I think the Christian imagery (a cup overflowing, rain in the desert) is too obvious to ignore. Viewed from that perspective, the first verse is God speaking to a woman - knock and the door shall be opened unto you.

The second verse is a straightforward testimonial - I'm a church musician, and I would play this song in a contemporary service anytime.

@cbehrens Great observation about the lyrics. First time I saw someone see spirituality in rock music. A couple of additional thoughts. Are we really hearing the lyrics as published. Check out controversial words online (Laurel/Yanny), then listen to song again. You might hear in the second verse " With Heaven helping. Got the tables turning. Got me thru my darkest hour," where you might be tempted with Suicide. Where the stress like a burning desert then turns to a sweet sun(son)shower . Like the Holy Spirit. And what book do tou turn pages in maybe...

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