Yoda

Beware of the Dark Side.  Anger, Fear, Agression.  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.

Anger, fear, aggression. The dark side are they. Once you start down the dark path, forever will it dominate your destiny.

Soon will I rest, yes, forever sleep. Earned it I have. Twilight is upon me, soon night must fall.

Size matters not. Look at me. Judge me by my size, do you? Hmm? Hmm. And well you should not. For my ally is the Force, and a powerful ally it is. Life creates it, makes it grow. Its energy surrounds us and binds us.

Luminous beings are we, not this crude matter.

Fear is the path to the dark side. Fear leads to anger. Anger leads to hate. Hate leads to suffering.

     "Fear is the path to the dark side. Fear leads to anger. Anger leads to hate. Hate leads to suffering."

"What's in there?" Questioned Luke, "Only what you take with you." Answered Master Yoda.
(About the dark side and fear)

Fear is a path to the dark side.

The fear of loss is a path to the dark side.
Death is a natural part of life.
Rejoice for those who transform into the force.
Miss them do not, mourn them do not.
Attachment leads to jealousy.
The shadow of greed that is.