All the lives we could never have, we could never have throughout eternity.
In a purely material world, there might be many identical versions of you. Every choice you made in life had, in fact, already happened. Yet it was difficult to find the "right choice" and live the life we wanted.
This was Nietzsche's eternal recurrence.
Not until you found a reason in life to accept the cycle of existence, viewing all suffering as a necessary step in life, could you accept it peacefully.
For example, if you had a Time-Turner and could return to any moment to "change history," yet chose not to do so.
Albus had lost his sister Ariana. If he could return to the moment Aberforth confronted Grindelwald, or even earlier, when three Muggle children attacked Ariana, and appear to drive them away, perhaps everything would have been different.
At that moment, someone knocked on the office door, and Pomona set down the book in her hands.
"Come in."
As the door opened, Liz Turt walked in.
"You wanted to see me, Head of House," Liz said.
"It's been a long time," Pomona said with a smile. "How is your conservation base going?"
"It's progressing smoothly so far. A fishing boat passed by a few days ago," Liz said with a smile.
"I'm glad to hear it. Please, sit," Pomona said.
"Thank you," Liz said.
Pomona placed a large mug of Butterbeer in front of Liz.
No child could refuse Butterbeer. Even though Liz was already an adult, she still drank it.
"Winter's coming soon. How about spending the winter at school?" Pomona asked. "I happen to have a job for you."
"What is it?" Liz asked.
"Help me continue monitoring Barnaby and Ben Cooper."
"Paul still hasn't left?" Liz asked worriedly.
"That's why I