" If your mind isn’t within the three realms, it’s beyond them. The three realms correspond to the three poisons: greed corresponds to the realm of desire, anger to the realm of form, and delusion to the formless realm. And because karma created by the poisons can be gentle or heavy, these three realms are further divided into six places known as the six states of existence. "

― Bodhidharma , The Zen Teaching of Bodhidharma