Who said "Change is the only constant across the realms."?

This quote is attributed to Heimdall.

Change is the only constant across the realms. - Heimdall

"Change is the only constant across the realms."

Heimdall Change

"I am Heimdall, guardian of the Bifrost. I see all, I hear all."

"The nine realms are connected, and I watch over every thread that binds them."

"Vigilance is not a burden—it is a privilege."

"I have stood at this post since before your kind learned to walk upright."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."