1. Himmel's "In that case it'll be Frieren's duty. She shall carry our memory to the future": I do wonder whether the reason we don't ever see elves in human settlements, is because they develop so slowly (like Frieren) and so have no objections to carrying more and more such 'memories' with them as they meet people while passing through the ages. But then, a time can come when they finally are able to process the emotions behind these memories and they.. well. They go insane?
2. Frieren's "Himmel was my reason for getting to know humans. It's equally as important as your reason to protect the village". Well that's the strongest way she's ever asserted her feelings up until now. And those feelings do seem to crystalize more and more the closer they are to the destination. Also, by contrasting her ability to perfectly recall her memories, with the failing memory of Voll, Frieren seems even less human.
3. Frieren's "I will bring Grandfather Voll's memory with me to the future as well." Adding yet another one to the pile. Is she like a book that's just getting another entry on one of the pages, or rather, is she a prisoner chained down that's slowly being bled by a thousand tiny cuts?
4. Voll's "Frieren, I had a dream of my wife". The value - and power - of the memories carried by Frieren. She was able to restore his wife's image to Voll.