Sorry to drag up an old one, but I just found this thread while searching for the second verse lyrics to Tibby Dunbar.
A friend posted a Confucius quote on his Facebook status:
"With coarse rice to eat, with water to drink, and my crooked arm for a pillow—is not joy to be found therein? Riches and honors acquired through unrighteousness are to me as the floating clouds."
and I wanted to respond with the related sentiments in verse 2 of Tibby, so I checked the lyrics for accuracy compared to my memory.
Anyway, the point of the rambling post is to pay respects to Jim for writing the addition to Burns's song. IMHO, Jim, you eclipsed the man himself with those last two lines.
I confess that, before reading this thread, I had believed that the whole thing was written by the great Mr B.
I live and learn.