Sith Philosophy
Although the Jedi treat Sith Philosophy as one monolithic entity, there are actually a wide variety of view points amongst dark side force users. Most, but not all, can trace their history to the early movement within the jedi order where a young generation of force users desired to explore their emotions and rebelled against a jedi order which forbade this experimentation before losing and being cast into exile. These fallen jedi formed the core of the first Sith Empire.
Many modern Sith, especially those who were once Jedi, acknowledge the Sith Credo as a cornerstone of their personal beliefs. Others draw on the writings of Krang Zang, an early anarcho-capitalist philosopher dating to the first years of the Republic. Others prefer the writings of Zim the Stout, a pre-Republic political philosopher.
Some Sith, especially those interested in temporal power but who stress personal control, describe morality and ethics in terms of conflicts between the Weak and the Strong. They feel that with the proper application of Sith principles, they can overcome the slave mentality which threatens, so they say, to dominate the galaxy. They speak of a being who will fully embody their beliefs, the Sithari.
Other less cerebral sith believe only in personal strength reached throuch conflict. This has been called the 'meat head' approach... Strength of arms is an end unto itself.
Davrosh espouses a philosophy in direct contradiction to Garrek Brynn. Davrosh believes power should be used to build something lasting, whereas Brynn is an anarchist who would love to see all of civilization in flames.
Jedi and Sith generally agree that the Sith Nihists are a depressing lot.
A variety of primal and ego-centric religions have been blended with Sith beliefs, including some of the original religious beliefs of the Sith race. Some feel that they have a Divine right, by virtue of force sensitivity, to rule over non-force-sensitives.
Fallen Jedi sometimes seek to act exactly the 'opposite' of how they were trained to behave as Jedi and call this a Sith philosophy. They invert rituals and symbols of the order, and revel in their own badness. (Sith Satanists). Most consider this derivative pap.
Some feel that research should have no restraints, regardless of apparent ethical implications. For these sith, such as perhaps Nakail, knowledge is an end to itself.
There are Sith hedonists who believe that their own personal pleasure and the gratification of their own ego is an ends unto itself. They are not noted for especially long careers, although their exploits have often become legend before they self-destructed... figuratively or literally.
Sith are no more fond of the Potentium Heresy than Jedi, although many sith acknowledge it as a valuable tool to corrupt foolish young jedi.
Sith who are trained from detection as weak force sensitives until they become knowledgeable Sith... when they survive their training... are often noted for their relative stability, as they are introduced to a self-contained Sith framework and have a powerful overseer who can help mold them into a stable individual instead of a quick spiral into self-destruction.
Although some Fallen Jedi are undisputedly crazy, this does not constitute an individual philosophy per-se. This can also be a result of possession by Sith Force ghosts, which creates the appearance of schizophrenia and multiple personalities.
See also: Jedi Philosophy