The Theme of it All

I read a wonderful article in the RWR recently about theme and how it plays into books/stories.

According to the article, theme is the passion and question inside the writer that finds its way into all her stories. Beneath voice and plot is theme.

I'm not detail-oriented and I'm not a plotter, but after having a few manuscripts of different genres and tones under my belt, I have an idea of what the overarching theme of my stories is (note: love is not necessarily a theme).

Do you think about Theme in your writing? Do you analyze it in books?