Who said "The work of a great leader is never finished."?

This quote is attributed to Drogo.

The work of a great leader is never finished. - Drogo

"The work of a great leader is never finished."

Drogo Work

"I am the stallion who mounts the world"

"A Dothraki hears a word and takes it as a command"

"You are of my blood. That is enough"

"I will take what is mine with fire and blood"

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."