One of the first things that a Jedi must learn is the Jedi code; this philosophy lays the groundwork for the mastery of the use of the Force. The Jedi must carefully observe the rules of the light side of the Force to maintain harmony with themself and the universe around them. The Responsible Use of Power. A Jedi acts from wisdom, using persuasion and counsel over violence and Force powers. Force powers are to be used to serve the interests of the light. Using the Force for personal aggrandizement, for persona power or wealth, for convenience when other means would be more prudent - all of these traits are of the dark side.
A Call to Action. A Jedi cannot allow evil to occur by inaction - a Jedi who voluntarily stands by and allows evil to be committed is encouraging the forces of darkness. Tremors in the Force. The Jedi lives in harmony with the Force, sensing its flow, drawing upon its energies ... and sometimes perceiving "disturbances" and "presences" in that flow. Premonitions and Visions. Some Jedi experience premonitions, dreams and visions. Sometimes these events seem to be little more than random, impressionistic images, but at other times they are crystal clear glimpses of past, present or possible future events. There is much debate as to the cause of there phenomena - perhaps it's the Jedi's subconscious at work, or perhaps it's simply a different way of sensing tremors in the Force - but these occurrences have been known to warn Jedi of impending danger or to summon them to "crisis areas" where their unique abilities are needed.There is no emotion; there is peace.
There is no ignorance; there is knowledge.
There is no passion; there is serenity.
There is no death; there is the Force.
The light side is created and sustained by life. The Jedi acts to preserve life. To kill is wrong.
Sometimes it is necessary to kill. The Jedi may kill in self-defense or in defense of others, especially the weak and the good. The Jedi may kill, if by their action he/she preserves the existence of life. However, the Jedi must never forget that killing is inherently wrong. The death is a stain upon the Jedi's spirit.
The Jedi seeks knowledge and enlightenment, peace and harmony. The Jedi wishes to defeat those who would wipe out such qualities - those who would inflict death, tyranny or ignorance upon others - yet the Jedi should never act out of fear or hatred. Jedi must act when calm and at peace with the Force. To act with anger filling one's spirit is to risk temptation to the dark side.
Jedi should seek nonviolent solutions o problems - but this isn't always possible. Sometimes, killing or fighting is the only anwser available. Sometimes it is even the best anwser. But that doesn't mean the Jedi shouldn't try to find an alternative.
Jedi are also bound by the actions of those around them. It is not acceptable for a Jedi to associate with those who willfully choose to commit evil.
When a Jedi is confronted by a situation where evil is being committed, the Jedi must act to prevent that evil. There are a variety of means at the Jedi's disposal - persuasion, creating a distraction, armed action or simple mind tricks - but intervention is necessary.
The actions of others can cause disturbances in the Force. A lone individual's impression might be like a candle flickering in the wind, while a great tragedy or act of great good may be like a sudden burst of lightning. Those who manipulate the Force often and with great power shine like the light of a sun.
Each time a Jedi draws upon the Force, there is a slight tremor as the Force is subtly altered. If the Force is used sparingly and with harmony in the natural order of things, such tremors are slight and barely detectable even at close ranges.
Those who frequently use the Force cause many, many tremors. When the Force is relied upon - used constantly to bend the universe to fit the will of the user - such tremors may be great enough that Jedi on distant planets may detect the user. Those who use the Force as a crude instrument of power are very likely to come to the attention of others.
New Jedi students are particularly likely to be detected. In their desire to master their powers, they often manipulate the Force ... yet their dabblings, if too frequent, draw the attentions of other nearby Force-users. The purge of the Jedi was facilitated by servants of the Emperor who detected, tracked and exterminated novice Jedi.