The lost line is:

If you've learned something from your sorrow and pain,
Tell everybody what you have gained.

I have one of the few DJ Promotional copies. It was a very limited release on 45 rpm. I heard Sylvia at a resort in Northern Minnesota many years ago and told her I had the record. She said, "My God, I didn't even know they released that!"

I am sorry the song didn't do better. It suited their particular blend of vocal harmony and power.

Jon Erickson