Luke Skywalker:"(examines the object given to him by Obi-Wan Kenobi) What is it?"
Obi-Wan Kenobi:"It's your father's lightsaber. This is the weapon of a Jedi Knight. Not as clumsy or random as a blaster. (Luke activates the lightsaber) But an elegant weapon for a more... civilized age. For over a thousand generations, the Jedi Knights were the guardians of peace and justice in the Old Republic. Before the dark times... before the Empire. (Luke deactivates the weapon)"
Luke Skywalker:"How did my father die?"
Obi-Wan Kenobi:"A young Jedi named Darth Vader, who was a pupil of mine until he turned to evil, helped the Empire hunt down and destroy the Jedi Knights. He betrayed and murdered your father. Now the Jedi are all but extinct. Vader was seduced by the dark side of the Force."
Luke Skywalker:"The Force?"
Obi-Wan Kenobi:"Well, the Force is what gives a Jedi his power. It is an energy field created by all living things. It surrounds us and penetrates us; it binds the galaxy together."