Read the following poem and answer the question that follows.

"When I Was One-and-Twenty," by A.E. Housman

When I was one-and-twenty
I heard a wise man say,
'Give crowns and pound and guineas
But not your heart away;

Give pearls away and rubies
But keep your fancy free.'
But I was one-and twenty,
No use to talk to me.

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.
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