From Anna Karenina:
"He soon felt that the realization of his desires gave him no more than a grain of sand out of the mountain of happiness he had expected. It showed him the mistake men make in picturing to themselves happiness as the realization of their desires... He was soon aware that there was springing up in his heart a desire for desires - ennui."
"At every step he experienced what a man would experience, who after admiring the smooth, happy course of a little boat on a lake, should get himself into that little boat. He saw that it was not all sitting still, floating smoothly; that one had to think too, not for an instant to forget where one was floating; and that there was water under one, and that one must row; and that his unaccustomed hands would be sore; and that it was only to look at it that was easy; but that doing it, though very delightful, was very difficult."
"He felt for the first moment as a man feels when, having suddenly received a violent blow from behind, he turns round, angry and eager to avenge himself, to look for his antagonist, and finds that it is he himself who has accidentally struck himself, that there is no one to be angry with, and that he must put up with and try to soothe the pain."