Luke starts Jedi Training from Master Yoda:
Yoda: "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 it will 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: "How do I 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 an attack."
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