'The Unbearable Lightness of Being'

http://en.wikipedia.org/wiki/The_Unbearable_Lightness_of_Being
Philosophical underpinnings (sourced from Wikipedia)
Challenging Friedrich Nietzsche’s concept of eternal recurrence (the idea that the universe and its events have already occurred and will recur ad infinitum), the story’s thematic meditations posit the alternative; that each person has only one life to live, and that which occurs in life occurs only once and never again — thus the “lightness” of being. In contrast, the concept of eternal recurrence imposes a “heaviness” on our lives and on the decisions we make (to borrow from Nietzsche's metaphor, it gives them "weight".) Nietzsche believed this heaviness could be either a tremendous burden or great benefit depending on the individual's perspective.

The Unbearable Lightness of Being was one of the titles in the list of 24 we were given, I researched it on the internet and found that it was a novel written in 1984.