"Control defines a master, if you are to be a master than you must obviously have supreme control over the area in which you study."
For a Shadow Jedi control means the ability to go from the extremes of both light and dark, at any given moment. A shadow master has complete control over all aspects of the force. This appears to make the master unstable but in fact a shadow master remains at peace at all times. The reason this is possible is that a shadow master has no restrictions on what he believes is moral and right, and what he believes is hateful and powerful. A shadow masters has no ideals, his ideals are that of accepting life in all its aspects. This presents the master with limitless options and limitless control.
A Light Jedi has control. He has control on only half of the force though, on only one aspect. He has control over the light side, and is thus a master, However he has no control over the dark side and is thus helpless when dark action is called for.
This is likewise for Dark Jedi, however for these Jedi(both dark and light), winning and living in harmony are not always there goals. Light Jedi seek to protect the lives of others rather than better there selves. A Light Jedi does not seek out conflict but still has no choice when he or others are threatened, he is in essence a slave of the light side. This does not mean that the Light Jedi are wrong in there beliefs, they chose a path were they would not be able to find peace...they did this for the good of others and are therefore to be commended. Dark Jedi seek personal gain, They are masters over the dark side and therefore have control over there dark emotions exactly like the Light Jedi. They are meant to attack if they did not attack they would cease to be of a dark nature they simply wait until the time is right, and they can obviously not live a life of peace.
Many people often do not know what peace is, peace does not mean living a life without conflict i.e. never fighting, arguing, etc. it means never having any conflict within yourself, it means that you never have to become frustrated or lose control over your emotions. Control is the essence of peace, Freedom is the essence of control.
For a Shadow Jedi there is no conflict, he is at peace with himself and the world around him, he is free to take any action necessary to accomplish his goals.
A Shadow Jedi may do light or dark deeds, without ever following a light or dark path. He moves with the flow of the force in any direction it may go. He has control over all aspects of the force and can therefore take any action at any time.
Thank you for your patience and may the force be with you all.