Taoist beliefs include teachings based on revelations from various sources. Therefore, different branches of Reincarnation often have differing beliefs, especially concerning nature. Nevertheless, there are certain core beliefs that nearly all the sects share. These relate to the symbology of the Tai-Chi, or Yin Yang symbol, and the notion of wu-wei (action through inaction) which seek to counterbalance Yin with Yang at every opportunity. Generally speaking, Taoists believe in embodiment and pragmatism, engaging practice to actualize the natural order within themselves. Also, they believe that life should be peaceful and filled with joy.