Hercules' first difficulty is that Iole is in love with Hyllos, Hercules' own son.

NPR: Heroic Obsession: Cavalli's 'Hercules In Love'

Time and again we've been reminded of the difficulty of building a nation in which we're all free to live and love as we see fit.

WHITEHOUSE: President Obama Commemorates Enactment of Hate Crimes Prevention Act | The White House

It attempts to tackle the opera's main difficulty: how can the cold-hearted ice princess Turandot fall suddenly and deeply in love with her suitor, Calaf?

NPR: Chinese Composer Gives 'Turandot' a Fresh Finale