I remember hearing that before. I really hope that's not true or else what the heck happened?

Yoda: Yes, 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.