In Buddhism, especially Zen and Chan, Non-abidance (Apratisthita in Sanskrit) is the practice of avoiding mental constructs during daily life. That is, other than while engaged in meditation (zazen). Some schools of Buddhism consider Apratisthita Nirvana ("non-abiding cessation") to be the highest form of Buddhahood.
The Diamond Sutra, a classic Buddhist text, is primarily concerned with the idea of non-abidance. The concept seems to have originated with the 1st century Indian Buddhist philosopher Nagarjuna, whose version of Śūnyatā, or emptiness, entails that entities neither exist, nor do they not exist.