Who said "A leader must be willing to sacrifice."?

This quote is attributed to Jon Snow.

A leader must be willing to sacrifice. - Jon Snow

"A leader must be willing to sacrifice."

Jon Snow Leadership

"The things we love destroy us every time."

"I am of the night."

"The North Remembers."

"When the snows fall and the cold winds blow, the lone wolf dies, but the pack survives."

"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"