Leonidas: In the end......a Spartan's true strength is the warrior next to him. So give respect and honor to him, and it will be returned to you. First... you fight with your head.
Gorgo: Then you fight with your heart. Leonidas: What is it?
Gorgo: A Persian messenger awaits you.
Leonidas: Do not forget today's lesson.
Son: Respect and honor.
Leonidas: Respect and honor.
Leonidas is teaching his son about what it means to be a Spartan warrior.