Who said "A leader who does not know himself cannot lead others."?

This quote is attributed to Drogo.

A leader who does not know himself cannot lead others. - Drogo

"A leader who does not know himself cannot lead others."

Drogo Leadership

"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"

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"