Keep in mind that this is my arrangement of this song. I don't know how close it is to the original melody. Yes, folks, it's the folk process at work.
Speaking of that pesky folk process, Songster Bob was right. The third line of the second verse should read:
Changeless affections, strength to prove
The second verse that I posted is also wrong, as I sing the line as follows:
Change least affections, strength to prove
The original words make a little more sense but I obtained the book long after I had learned the song. And you know, it is hard to teach an old dog new tricks.