I was first introduced to this verse a few years ago at a men's retreat. Our Pastor gave us this verse printed on a small piece of paper that read:
Be still and know that I am God
Be still and know that I am
Be still and know
His instructions were to spend 30 minutes walking on the beach by yourself repeating the verse as printed. I thought this will take 5 minutes and then I can "enjoy" walking on the beach. Not surprising the Spirit had other ideas. I spent the 30 minutes repeating the verse silently and out loud. I was amazed at how varying the tempo, time between the lines, emphasis on different words engendered new and different meanings. I felt a rich calmness.
Some online commentaries mention that the hebrew translation for "still" can mean to slacken, to let drop, to be weak. I doubt you would find any of those words on a corporate mission statement.
On occasion Rebecca will look at me and say "relax," "loosen-up." She would drop her hands to demonstrate. Even as a write this I feel some tension -- got to get it done!
We need the repetition and stillness to know God and to be healed. We come together weekly to worship for those reasons. Thank you to the ones who provide the periods of silence. More would not be a bad thing. :)