Palpatine: Did you ever hear the tragedy of Darth Plagueis "the wise"?
Anakin Skywalker: No.
Palpatine: I thought not. It's not a story the Jedi would tell you. It's a Sith legend. Darth Plagueis was a Dark Lord of the Sith, so powerful and so wise he could use the Force to influence the midichlorians to create life... He had such a knowledge of the dark side that he could even keep the ones he cared about from dying.
Anakin Skywalker: He could actually save people from death?
Sheev: The dark side of the Force is a pathway to many abilities some consider to be unnatural.
Anakin Skywalker: What happened to him?
Supreme Chancellor: He became so powerful... the only thing he was afraid of was losing his power, which event...