When I was one-and-twenty I heard him say again, 'The heart out of the bosom Was never given in vain; 'Tis paid with sighs...

When I was one-and-twenty
I heard him say again,
'The heart out of the bosom
Was never given in vain;
'Tis paid with sighs a plenty
And sold for endless rue.'
And I am two-and-twenty,
And oh, 'tis true, 'tis true.

In one paragraph of at least three to five sentences, analyze the tone and imagery used in the line in bold. Identify the mood the author intended to create with this imagery, as well as the connotations used in the words "vain," "endless rue," and "oh." Use proper spelling and grammar