It's such a great novel. My favorite aspect, and probably what upset Tolstoy a bit, is the conflict between common sense and reality in matters of the heart. Anna, an uneducated master of the social world, succumbs to her natural desire and loses everything. Levin, a socially inept master of reality, learns the value of marriage and god he's always shunned and gains everything. I love the passage where Levin defines god while sitting in a field watching peasants. By far my favorite book.