What are the motifs in Black Dogs by Ian McEwan?

Admitting mistakes is a recurring idea. Realizing a mistake can be both a blessing and a curse, as June realizes on her honeymoon when her joyous future with Bernard is threatened by her realization that their shared communist ideals are a mistake. What is a young bride to do? She still loves Bernard, but a moment of transcendent clarity shows her that she's headed down the wrong path. June opted to admit her mistake instantly, on the spot, and pay penance for it by sacrificing her marriage to pursue her new truth.