| Quote #1
And Levin went out of the room, only when he was in the doorway remembering that he had forgotten to take leave of Oblonsky's colleagues. (1.5.73)
Levin is socially awkward. He's clearly not used to high society, since he prefers spending time on his country estate.
| Quote #2
Levin's conviction that it could not be was founded on the idea that in the eyes of her family he was a disadvantageous and worthless match for the charming Kitty, and that Kitty herself could not love him. In her family's eyes he had no ordinary, definite career and position in society, while his contemporaries by this time, when he was thirty-two, were already, one a colonel, and another a professor, another director of a bank and railways, or president of a board like Oblonsky. But he (he knew very well how he must appear to others) was a country gentleman, occupied in breeding cattle, shooting game, and building barns; in other words, a fellow of no ability, who had not turned out well, and who was doing just what, according to the ideas of the world, is done by people fit for nothing else. (1.6.6)
Levin is fully aware that the path he chose in life is not one that is admired by society at large, but is looked down upon instead. Levin provides a contrast to characters like Oblonsky and Karenin, who have impressive careers and live in the city, but don't have the happy, fulfilling life that Levin has by the end of the novel.
| Quote #3
In Moscow he had for the first time felt, after his luxurious and coarse life at Petersburg, all the charm of intimacy with a sweet and innocent girl of his own rank, who cared for him. It never even entered his head that there could be any harm in his relations with Kitty. At balls he danced principally with her. He was a constant visitor at their house. He talked to her as people commonly do talk in society – all sorts of nonsense, but nonsense to which he could not help attaching a special meaning in her case. Although he said nothing to her that he could not have said before everybody, he felt that she was becoming more and more dependent upon him, and the more he felt this, the better he liked it, and the more tender was his feeling for her. He did not know that his mode of behavior in relation to Kitty had a definite character, that it is courting young girls with no intention of marriage, and that such courting is one of the evil actions common among brilliant young men such as he was. It seemed to him that he was the first who had discovered this pleasure, and he was enjoying his discovery.
Having engaged in a life full of debauchery, Vronsky has no idea of how society views his conduct with Kitty. Though Vronsky feels that he has no obligations toward Kitty, thinking that they're just having a good time, she and her family fully expect him to marry her.