Who said "The past cannot be changed, only the future."?

This quote is attributed to Grey Worm.

The past cannot be changed, only the future. - Grey Worm

"The past cannot be changed, only the future."

Grey Worm Time

"I am Grey Worm. I have no name."

"Unsullied do not fear death."

"We are the dragons' soldiers."

"A soldier's duty is to obey."

"Time waits for no one."

"Time spent with loved ones is never wasted."

"I've been alive for a long time. Long enough to know that you can't trust anyone."

"The past always catches up with you."