" Now he experienced a feeling akin to that of a man who, while calmly crossing a bridge over a precipice, should suddenly discover that the bridge is broken, and that there is a chasm below. That chasm was life itself, the bridge that artificial life in which Aleksey Aleksandrovich had lived. For the first time the question presented itself to him of the possibility of his wife’s loving someone else, and he was horrified at it. "
― Leo Tolstoy , Anna Karenina