EXT. DAGOBAH - DAY With Yoda strapped to his back, Luke climbs up one of the many thick vines that grow in the swamp. Panting heavily, he continues his course - climbing, flipping through the air, jumping over roots, and racing in and out of the heavy ground fog. YODA Run! Yes. A Jedi's strength flows from the Force. But beware of the dark side. Anger... fear... aggression. The dark side of the Force are they. Easily they flow, quick to join you in a fight. If once you start down the dark path, forever will it dominate your destiny, consume you it will, as it did Obi-Wan's apprentice. LUKE Vader. Is the dark side stronger? YODA No... no... no. Quicker, easier, more seductive. LUKE But how am I to know the good side from the bad? YODA You will know. When you are calm, at peace. Passive. A Jedi uses the Force for knowledge and defense, never for attack. LUKE But tell me why I can't... YODA (interrupting) No, no, there is no why. Nothing more will I teach you today. Clear your mind of questions. Mmm. Mmmmmmmm. Artoo beeps in the distance as Luke lets Yoda down to the ground. Breathing heavily, he takes his shirt from a nearby tree branch and pulls it on.