How we cite our quotes: (Chapter.Paragraph)
Quote #10
Then he remembered that he would never be alone, and his panic slowly ebbed. (46.13)
It's not exactly clear what this means, though the suggestion seems to be that Bowman shares some sort of super-consciousness with the aliens. So humans and aliens really do fuse; the novel ends with humankind no longer being alone, not even in its skull. This is supposed to be a good thing, though you could also see it as maybe a little intrusive.