How we cite our quotes:
"Not at all," he said. "Listen to me. You can't see your own position as I can. Let me tell you candidly my opinion." Again he smiled discreetly his almond-oil smile. "I'll begin from the beginning. You married a man twenty years older than yourself. You married him without love and not knowing what love was. It was a mistake, let's admit." (4.21.24)
Anna has never known romantic love until Vronsky appeared in her life. Both Anna and Vronsky see this as a sort of justification for their affair.
As a bachelor, when he had watched other people's married life, seen the petty cares, the squabbles, the jealousy, he had only smiled contemptuously in his heart. In his future married life there could be, he was convinced, nothing of that sort; even the external forms, indeed, he fancied, must be utterly unlike the life of others in everything. And all of a sudden, instead of his life with his wife being made on an individual pattern, it was, on the contrary, entirely made up of the pettiest details, which he had so despised before, but which now, by no will of his own, had gained an extraordinary importance that it was useless to contend against. And Levin saw that the organization of all these details was by no means so easy as he had fancied before. Although Levin believed himself to have the most exact conceptions of domestic life, unconsciously, like all men, he pictured domestic life as the happiest enjoyment of love, with nothing to hinder and no petty cares to distract. He ought, as he conceived the position, to do his work, and to find repose from it in the happiness of love. She ought to be beloved, and nothing more. But, like all men, he forgot that she too would want work. And he was surprised that she, his poetic, exquisite Kitty, could, not merely in the first weeks, but even in the first days of their married life, think, remember, and busy herself about tablecloths, and furniture, about mattresses for visitors, about a tray, about the cook, and the dinner, and so on. While they were still engaged, he had been struck by the definiteness with which she had declined the tour abroad and decided to go into the country, as though she knew of something she wanted, and could still think of something outside her love. This had jarred upon him then, and now her trivial cares and anxieties jarred upon him several times. But he saw that this was essential for her. And, loving her as he did, though he did not understand the reason of them, and jeered at these domestic pursuits, he could not help admiring them. He jeered at the way in which she arranged the furniture they had brought from Moscow; rearranged their room; hung up curtains; prepared rooms for visitors; a room for Dolly; saw after an abode for her new maid; ordered dinner of the old cook; came into collision with Agafea Mihalovna, taking from her the charge of the stores. He saw how the old cook smiled, admiring her, and listening to her inexperienced, impossible orders, how mournfully and tenderly Agafea Mihalovna shook her head over the young mistress's new arrangements. He saw that Kitty was extraordinarily sweet when, laughing and crying, she came to tell him that her maid, Masha, was used to looking upon her as her young lady, and so no one obeyed her. It seemed to him sweet, but strange, and he thought it would have been better without this. (5.14.2)
Levin is astonished to see that Kitty isn't consumed by love, but has practical considerations. He also learns that married life isn't always smooth sailing. While Levin does not understand the importance of Kitty's domestic focus, he tries to respect her concerns anyway.
"Respect was invented to cover the empty place where love should be. And if you don't love me any more, it would be better and more honest to say so." (7.24.31)
Anna finds the idea of Vronsky's respect abhorrent – she wants his love. She's been in a loveless relationship before (with Karenin), and is terrified of losing Vronsky. She's also bitter because she gave up everything – her reputation, her son, etc. – for love of Vronsky. Without him, she feels she'd have nothing left.