Love, then, is his most persistent theme and it has been for him an inexhaustible subject.

The difficulty of articulation is the book's most persistent theme.

Several persistent themes began to emerge a thousand years ago on the Iranian plateau.

But there's a persistent theme that crops up on the bulletin boards.

Especially during the 1990s, the sea was a persistent theme in Dean's work.

Expressing gratitude is also a persistent theme throughout pop music.

The most persistent theme throughout his films is tension in parent-child relationships.

A persistent theme in Italian music this century has been the struggle not to write opera.

Recruiting more people from outside Europe is another persistent theme.