Who said "To truly lead, one must be willing to stand alone."?

This quote is attributed to Lannister.

To truly lead, one must be willing to stand alone. - Lannister

"To truly lead, one must be willing to stand alone."

Lannister Leadership

"A Lannister always pays his debts."

"I am the god of tits and wine."

"You are an awful man."

"I drink and I know things."

"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"