WARNING: thread creep!

When I was a Boy Scout (longer ago than recorded history), I was on a Scout camping trip, and there was singing around the campfire. The Scoutmaster sang a version of this song (a more religious version, I gather). His rendition included a passage that I remember as:

I've got the peace a pass that makes the thunder
down in my heart! Down in my heart! ...(etc.)

Since then, I have seen lyrics that included the passage "I've got the peace that passeth understanding ...", but I have not found a version with the words that the Scoutmaster sang.

An obvious answer to this is "Don - you idiot - you either misunderstood what he sang, or are mis-remembering it now, or both!" Maybe. But my memory of at least "... that makes the thunder ..." is quite clear.