The dark side of the Force is the path way to many abilities some consider to be unnatural.
10 seconds sound clip from the Star Wars: Episode III - Revenge of the Sith movie soundboard.
You can hear this line at 00:47:03 in the Blu-ray version of the movie.
Quote context
[...]
- Did you ever hear the tragedy of Darth Plagueis the Wise?
- No.
- I thought not. It's not a story the Jedi would tell you.
- He had such a knowledge of the dark side, he could even keep the ones he cared about from dying.
- He could actually save people from death?
- The dark side of the Force is the path way to many abilities some consider to be unnatural.
- It's ironic. He could save others from death, but not himself.
[...]