A Jedi was a member of the Jedi Order, an ancient order of protectors united by their ability to harness the power of the Force. Adhering to a doctrine that favored the light side of the Force, the Jedi aspired to attain a state of inner tranquility through calmness and meditation while avoiding emotions affiliated with the dark side of the Force, such as anger and hatred. Nevertheless, Jedi philosophy did not forbid a Jedi from acting in self-defense or in the defense of others. To that end, the weapon of a Jedi was the lightsaber, a blade composed of pure energy and different colors such as blue or green.