Mushin (mental state). 'Mushin' in Japanese and 'Wuxin' in Chinese (無心 "no mind") is a mental state.

 
Mushin (mental state). 'Mushin' in Japanese and 'Wuxin' in Chinese (無心 "no mind") is a mental state. Zen and Daoist meditators are said to reach this state, as well as artists and trained martial artists.They also practice this mental state during everyday activities. Etymology
The term contains the character for negation, "not" or "without" (無), along with the character for heart-mind (心). The term is shortened from mushin no shin (無心の心), a Zen expression meaning the mind without mind and is also referred to as the state of "no-mindness". That is, a mind not fixed or occupied by thought or emotion and thus open to everything. It is translated by D.T. Suzuki as "being free from mind-attachment". Description

Mushin is achieved when a person's mind is free from thoughts of anger, fear, or ego during combat or everyday life. There is an absence of discursive thought and judgment, so the person is totally free to act and react towards an opponent without hesitation and without disturbance from such thoughts. At this point, a person relies not on what they think should be the next move, but what is their trained natural reaction (or instinct) or what is felt intuitively. It is not a state of relaxed, near-sleepfulness, however. The mind could be said to be working at a very high speed, but with no intention, plan or direction.

Some masters believe that mushin is the state where a person finally understands the uselessness of techniques and becomes truly free to move. In fact, those people will no longer even consider themselves as "fighters" but merely living beings moving through space.

The legendary Zen master Takuan Sōhō said: The mind must always be in the state of 'flowing,' for when it stops anywhere that means the flow is interrupted and it is this interruption that is injurious to the well-being of the mind. Once mushin is attained through the practice or study of martial arts (although it can be accomplished through other arts or practices that refine the mind and body), the objective is to then attain this same level of complete awareness in other aspects of the practitioner's life. wiki. org
http://ginthevagabond.com/products/Mushin-TheUnboundedSpirit.pdf