How Can I Keep From Singing

I should have posted this yesterday for Music Monday, but I was battling a refrigerator that doesn't love summer heat any more than I do.

We sang this at church on Sunday and it's been in my head ever since.  We sounded nothing like either Eva Cassidy or Enya, but I wanted to give two versions for contrast.

I love the entire song, but the line that has embedded in my brain is thankfully this:

No storm can shake my inmost calm,

while to that rock I'm clinging.
Since love is lord of heaven and earth
how can I keep from singing?