Possible Clues:

• "Exact estimate" and "unbiased opinion"
• Shakespeare’s “sweet sorrow” and “fearful bravery,” e.g
• Old axes then again taken into battle, ridiculous things
• Contradictions in terms
• 'Guest host' and 'civil war'
• ''Guest host'' and ''solo concert''
• Theme of this puzzle
• Lacking leadership, sly fools, horribly good things?
• Figures of speech with an apparent contradiction
• The theme of this puzzle