They don’t need walls and water to keep the prisoners in, not when they’re trapped inside their own heads, incapable of a single cheerful thought. Most go mad within weeks - Lupin

That's what they should teach us here. How girls' brains work... It would be more useful than divination, anyway.

He did not know or care whether they were wizards or Muggles, friends or foes; all he cared about was that a dark stain was spreading across Dobby's front, and that he had stretched out his thin arms to Harry with a look of supplication. Harry caught him and laid him sideways on the cool grass. "Dobby, no, don't die, don't die -" The elf's eyes found him, and his lips trembled with the effort to form words. "Harry...Potter..." And then with a little shudder the elf became quite still, and his eyes were nothing more than great glassy orbs, sprinkled with light from the stars they could not see.

To have been loved so deeply, even though the person who loved us is gone, will give us some protection forever.

Failure is so important. We speak about success all the time. It is the ability to resist failure or use failure that often leads to greater success. I've met people who don't want to try for fear of failing.

First sign of madness, talking to your own head.

Their reward for enduring the awful experience was the right to tell people about it.