Yoda: Destroy the Sith we must.

Obi-Wan Kenobi: Send me to kill the emperor. I will not kill Anakin.

Yoda: To fight this Lord Sidious, strong enough you are not.

Obi-Wan Kenobi: He is like my brother. I cannot do it.

Yoda: Twisted by the dark side young Skywalker has become. The boy you trained, gone he is. Consumed by Darth Vader.