Who said "The man who refuses to change is already dead."?

This quote is attributed to Xenophon.

The man who refuses to change is already dead. - Xenophon

"The man who refuses to change is already dead."

Xenophon Change

Historian Soldier Ancient Greece 430–354

"The sweetest of all sounds is praise."

"He who wishes to be obeyed must know how to command."

"It is impossible for a man to be cheated by anyone but himself."

"Know thyself."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."