Yoda: If once u start down the dark path, forever it will dominate ur destiny.
Luke Skywalker: Is the dark side stronger?
Yoda: No No. Quicker. Easier, more seductive.
Luke: How do I know the good from the bad?
Yoda: You will know when you are calm. At peace, passive. A jedi uses the force for knowledge and defence. Never for attack.
Luke: Tell me why…
Yoda: There is no why.
Watch your kids grow up to Star Wars and Lord of the Rings DVDs, rest assured they won’t need moral science lessons. Once they grow up just a little, put them on a diet of The Matrix.
I also love this conversation they have when young Anakin Skywalker meets Yoda and the other Jedis for a personal interview before admission into Jedi training:
Yoda: How feel you?
Anakin: Cold, Sir.
Yoda: Afraid are you?
Anakin: No, Sir.
Yoda: See through you we can.
Other Jedis: Be mindful of your feelings. Your thoughts dwell on your mother.
Anakin: I miss her.
Yoda: Afraid to lose her I think.
Anakin: What does that have to do…
Yoda: Everything. Fear is the path to the dark side. Fear leads to anger. Anger leads to hate. Hate leads to suffering. I sense much fear in you.