Quote 1
"…It warns in this book how unstable you make the rest of your soul by ripping it, and that's just by making one Horcrux!"
Harry remembered what Dumbledore had said about Voldemort moving beyond "usual evil."
"Isn't there any way of putting yourself back together?" Ron asked.
"Yes," said Hermione with a hollow smile, "but it would be excruciatingly painful."
"Why? How do you do it?" asked Harry.
"Remorse," said Hermione. "You've got to really feel what you've done. There's a footnote. Apparently the pain of it can destroy you. I can't see Voldemort attempting it somehow, can you?" (6.71-73)
The matter of exactly how evil Voldemort is – more evil than anyone else has ever been, apparently – is one of the most frightening things about him. As Hermione notes, it's unlikely that he'll ever feel any remorse for any of the terrible things he's done.
Quote 2
"'The Tale of the Three Brothers' is a story," said Hermione firmly. "A story about how humans are frightened of death. If surviving was as simple as hiding under the Invisibility Cloak, we'd have everything we need already!" (22.6)
Hermione's kind of right – and mostly wrong, given the events of the rest of the book. Her point about humans' fear of death is right on, though; we'll do anything to talk around, above, and through death and the threat of it.
Quote 3
"…I'm as hunted quite as much as any goblin or elf, Griphook! I'm a Mudblood!"
"Don't call yourself –." Ron muttered.
"Why shouldn't I?" said Hermione. "Mudblood, and proud of it!" (24.87)
Hermione shows her strength and her confidence in her own identity here – she's not ashamed of her Muggle background, and she knows that it makes no difference to her Wizarding abilities.
Quote 4
"Ron, we're the only ones who can end it! Please – Ron – we need the snake, we've got to kill the snake!" said Hermione.
But Harry knew how Ron felt: Pursuing another Horcrux could not bring the satisfaction of revenge; he too wanted to fight, to punish them, the people who had killed Fred, and he wanted find the other Weasleys, and above all make sure, make quite sure that Ginny was not – but he could not permit that idea to form in his mind – .
"We will fight!" Hermione said. "We'll have to, to reach the snake! But let's not lose sight now of what we're supposed to be d-doing! We're the only ones who can end it!" (32.14-16)
Again, in a time of desperation, Hermione's the only one who keeps the group on track – despite all of their grief over Fred, she reminds her friends that they must keep going, and that the end is finally in sight – if they can only get there!
Quote 5
"… the wand would be bound to attract trouble –."
"Only if you shouted about it," argued Ron. "Only if you were prat enough to go dancing around, waving it over your head, and singing, 'I've got an unbeatable wand, come and have a go if you think you're hard enough.' As long as you could keep your trap shut –."
"Yes, but could you keep your trap shut?" said Hermione, looking skeptical. (21.57)
Hermione brings up a good point here – one of the greatest dangers of having a ton of power is the temptation to brag about it and thus get yourself in more trouble than said power is worth.