Boris Pasternak - Doctor Zhivago
Yuri Andreevich felt his dreams of a more settled life in Varykino were not to be realised, that the hour of his separation from Lara was at hand, that he would inevitably lose her, and after that the incentive to live, and maybe even life itself. Anguish gnawed at his heart. But still greater was his longing for the coming of evening and the desire to weep out this anguish in expressions that would make everyone weep.
The wolves he had been remembering all day were no longer wolves in the snow under the moon, but became the theme of wolves, the representation of a hostile power that had set itself the goal of destroying the doctor or Lara or driving them from Varykino.