In Star Wars, there are two factions fighting against each other. The first puts a value on peace and serenity, on understanding and merging with the force, while the other puts an emphasis on raw passion and the strength that expressing that gives. Two factions that divide into the two sensing functions; Si and Se.
Take a look at the code for the Jedi order: “There is no emotion, there is peace. There is no ignorance, there is knowledge. There is no passion, there is serenity. There is no chaos, there is harmony. There is no death, there is the force.” Now imagine for a second that a sensing function deals with “the force”, for the sake of argument. The Jedi order approaches the force in a soft, receptive manner. They try to become one with the force; merging with it. There is peace, there is serenity. There is the force, and everything flows into it and from it. It’s a world-accepting, (not in that it doesn’t want to create any change, but in how it merges with it), flowing, and dynamic attitude. The Jedi order takes an Si approach to the force.
The order of the Sith on the other hand, approaches the force through Se. We can see this very easily in Anakin Skywalker and how his entire being was rejected by the Jedi order. “Piece is a lie, there is only passion. Through passion, I gain strength. Through strength, I gain power. Through power, I gain victory. Through victory, my chains are broken. The force shall free me.” Instead of merging with the force, instead of seeing it as something that ought to be internalized, like the Jedi order does, the order of Sith sees it as something external; a tool to be used, a vehicle to use, to free themselves. Passion, strength, and power, are all freely exerted with the goal of victory.
Looking at the two functions and their respective quadra, this way of approaching reality, whether through Si in a way that matches the Jedi order, or Se like the Sith, is clearly distinctive. Si valuing types, in their focus on the internal impression and reaction they create towards an external event, will want to make this impression as enjoyable as possible; as low-friction as possible. “There is no passion, there is serenity” and “there is no chaos, there is harmony” is exemplifying this mindset, although taken to the extreme. With the low-friction approach, they in a sense merge with the external, becoming one with it, as the differences disappear. Si is, in short, all about how the subject (person) experiences external events. How the “fields” of reality interact with the subject.
This sort of internalizing and merger is wholly absent in Se. Instead, Se is connected to strength and power. Not because it is strength and power, but because what Se is concerned with is the fields of objects and how they interact with each other (in contrast with how they interact with the subject). This gives them an understanding in struggles of influence and power, leading to the focus on strength and influence.