Luke: "What is it?"
R2-D2: "(Whistling)"
Obi-Wan: "Your father's lightsaber. This is the weapon of a Jedi knight. Not as clumsy or random as a blaster. An elegant weapon for a more civilized age. For over a thousand generations the Jedi kinghts were the guardians of peace and justice in the old Republic, before the dark times, before the Empire."