How we cite our quotes: (Chapter.Paragraph) Note that chapters aren't numbered, so need to be numbered manually, 1 to 14.
Quote #1
This was it, the descent. If I had not seen the figures racing across the dial, I would not have noticed the change in direction. I could hear my heart thudding heavily. I could feel the coolness form the air-conditioning on my neck, although my face seemed to be on fire. (1.12)
Kelvin's first experience of space in the book is of being trapped in himself; he can't tell where he is, or do much except hear his heart thud inside a metal box. Reaching outward just leaves you more trapped inside. Don't say Shmoop didn't warn you.
Quote #2
"Hello, Kelvin!" he croaked. "Well, did you discover anything?"
"Yes… he's not alone."
"Snow grinned sourly.
"Oh, really? Well, that's something. Has he got visitors?" (4.69-72)
Sartorius isn't alone… or is he? Does having visitors mean you're not alone, or more alone? Remember, Sartorius' visitors come out of his head, so it's like talking to your own daydreams. Not very social.
Quote #3
It was not possible to think except with one's brain, no one could stand outside himself in order to check the functioning of his inner processes. (4.95)
You're always in your brain, which means you're always isolated, unable to get away from yourself, or out in front of yourself. You're stuck and alone. Unless maybe you're a psychic space ocean—then all bets are off.
Quote #4
So the computer existed independently of me; that meant that the Station and its inhabitants really existed too. (4.103)
Kelvin has proved to himself that he is not just making everything up. He would maybe be disappointed to learn that Stanislaw Lem is making everything up, though, so even if he gets out of his head, he's still stuck in Lem's.
Quote #5
"… I saw you weren't there, I was very frightened, and…" (7.73)
Rheya explains why she Hulked out and bashed a door down when Kelvin left her alone. Remember, Rheya (the real Rheya) killed herself when Kelvin left her. It's not entirely clear if she is desperate not to be alone because that's how Solaris visitors work, or if it's part of her personality because it's part of her personality.
Quote #6
"We are the cause of our own sufferings. The polytheres behave strictly as a kind of amplifier of our own thoughts." (9.45)
It's not aliens that torture you, it's your own thoughts. The reason the visitors are bad news is because the scientists aren't talking to anyone else; they're trapped in their own heads. They need to get a Facebook account and meet other people, obviously.
Quote #7
Grastrom's conclusion was that there neither was, nor could be, any question of "contact" between mankind and any nonhuman civilization. (11.61)
Humans can only talk among themselves, as the scientists only talk to their visitors. Just as individuals are isolated, so is the whole species isolated, at least in Grastrom's opinion. You can't touch anyone, no matter how many tentacles they've got.
Quote #8
For days on end, I remained sitting in the library or in my cabin, accompanied by the silent shadow of Rheya. (12.9)
He's alone with Rheya, the construct, but he might as well be alone with Rheya, the memory. Or, to put it another way, Kelvin is grieving.
Quote #9
I was alone—alone in bed and in the cabin…
"Rheya!" I screamed, one last time, then my voice gave out. I already knew the truth… (13.41-44)
Kelvin's reaction here is almost exactly parallel to Rheya's reaction when Kelvin left her alone; he becomes violent and angry and then doesn't remember what he's done (though he doesn't tear through a door, it's true). Is Rheya's reaction the same as his because they're feeling the same emotions? Or because he created Rheya, and she's him? And if she's him, is he mourning himself? He may be the only one in there, which is presumably why he's upset.
Quote #10
I shall find new interests and occupations; and I shall not give myself completely to them, as I shall never again give myself completely to anything or anybody… And this future Kelvin will be no less worthy a man than the Kelvin of the past, who was prepared for anything in the name of an ambitious enterprise called Contact. Nor will any man have the right to judge me. (13.5)
Kelvin is contemplating a life of semi-isolation, in which he won't give himself to anyone again. Is the Kelvin in future semi-isolation different from the past Kelvin? Kelvin didn't seem like a particularly open or warm person to begin with, and you could see his embrace of construct-Rheya as an affirmation of isolation, rather than a breaking with it (since Rheya is just his memory). Kelvin's future (like Rheya's?) seems like it's going to be much the same as his past—isolated, in both cases.