The Jedi Code #SWTOR

The Jedi Code was a set of rules that governed the behavior of the Jedi Order. It taught its follower to not give in to feelings of anger toward other lifeforms, which would help them resist fear and prevent them from falling to the dark side of the Force.

Amongst other dictates, the Jedi Code forbade Jedi Knights and Jedi Masters from taking on more than one Padawan at a given time; and forbade Jedi from forming attachments, such as marriage, and other specific, individual bonds, such as romantic love and family. Few understood that this practice of nonattachment did not mean the Jedi were strangers to compassion when, in fact, they believed that all lives were precious.

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.

There also existed an alternate version of the Code, recited by Jedi younglings during their Initiate Trials, and by Depa Billaba during her full fitness re-assessment after waking up from her 6-month coma:

Emotion, yet peace.
Ignorance, yet knowledge.
Passion, yet serenity.
Chaos, yet harmony.
Death, yet the Force.

The Sith Code #Swtor

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The Sith Code forms the core beliefs of the Sith Order. It is derived strongly from the Jedi Code and was created by the first Dark Jedi to separate from the Jedi Order. It is the near opposite of the Jedi Code.

Mantra
Peace 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.

Zrophis a Sith Marauder

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Wielding two lightsabers and unmatched aggression, Sith trained as Marauders slice through enemy ranks dealing death with merciless efficiency. Whether annihilating a squad of Republic troops or cutting down a single Jedi, the Marauder sees and exploits every weakness to exact the greatest toll. Never hesitating, never faltering, there is no swifter bringer of pain in the galaxy. All Sith Marauders can wield two lightsabers in combat, crushing their foes with superior speed and becoming a terror on the battlefield. Marauders can opt to learn the ways of Annihilation, learning the Juyo lightsaber techniques and inflicting traumas upon their enemies; Carnage, specializing in swift movement and acrobatics to obliterate foes before they can react; and Rage, subduing cowering foes with lightsaber strikes and crushing them with the Force.

―In-game Codex