Who said "A leader must be a student first, a master only after."?

This quote is attributed to Yi Sun-sin.

A leader must be a student first, a master only after. - Yi Sun-sin

"A leader must be a student first, a master only after."

Yi Sun-sin Education

Military Admiral Korean 1545–1598

"The presence of a brave man in battle is worth a thousand men."

"Even if the enemy is stronger, courage and will can overcome any obstacle."

"A leader must be willing to sacrifice everything for his people."

"Victory is determined not by the size of the army, but by the resolve of its commander."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."