This comes from two characters in the Star Wars universe that you have never heard of. I love when they get into this stuff though.
It's between a 20 something Jacen Solo(one of Han and Lea's children) and Vergere (a non-human Jedi that had escaped the Jedi Purge (You know from revenge of the Sith, when Darth Vader started killing Jedi) when she was captured/ went with a race from outside of the galaxy (We learn from other books that Palpatine/ Darth Sidious, was trying to gain power and organize the galaxy so that he could defend the galaxy against this invasion which he saw in a force vision some 60 yeard before it happened. So many Sith were born with this vision of uniting the galaxy to bring about peace.). She returned when those beings then invaded the galaxy and captured Jacen.)
So Read on or just skip it...
I took this from here http://starwars.wikia.com/wiki/Vergere
To convince Jacen that there was no dark side, Vergere showed him a species of Yuuzhan'tar predator that had just successfully brought down its prey. She told him that the predator's adopted home was filled with what Jacen would call "the dark side." Jacen responded by telling her that what the animal did was not "the dark side," since it was merely following its nature, killing to get food to keep itself alive. Vergere then said to him "I thought the danger of the dark side was that it is natural; that's why it's easier than the light, yes?"
Jacen told her that the "real" dark side would be if the predator killed not just one animal, but an entire herd, and did so not out of hunger but just for fun, for the joy of killing. This prompted Vergere to ask Jacen if he believed the predator took no joy in its accomplishment of successfully killing its prey. Looking closer at the animal, it seemed to Jacen that the animal was pleased with itself.
As Jacen considered this and became more uncertain, Vergere asked more questions. "Kill one, it's nature, kill them all, it's the dark side? Is the line between nature and dark side only one of degree? Is it the dark side if that predator kills only half the herd? A quarter?"
Becoming frustrated, Jacen asserted that it was a matter of "need." That if the predator killed more animals than it needed to for its survival, those actions would be of the dark side. Vergere then launched a new series of questions, asking how "need" was defined. Was "need" the line of starvation or simple malnutrition? Would it be wrong of the animal to kill its prey and eat only half the carcass, wasting the other half? Would the animal's hunting be of the dark side if it and its family were a few pounds overweight and could survive without food for a time?
Jacen's protests that it wasn't about that made Vergere ask what it was about. She asked if intention always trumped action. What if, she asked, the predator slaughtered an entire herd thinking it needed them for food, then realized that it didn't need them after all and left them to rot? Would its intentions matter?
In an earlier conversation, Vergere had asked Jacen if he believed what he (and other Jedi) did was irrelevant, if he believed that the only relevant thing was why they did it.
