(Guk-Gi) is a double edged sword: on the one hand, it is the physical control with regard to motions, precision of execution, prevention of unnecessary injuries (as opposed to acting wildly) or killing, due to lack of control. Experiemce is the best teacher, but all the physical reactions are based on the psychological makeup, maturity and moral, ethical and religious codes. Emotions are usually involved, to a certain degree, in the majority of situations, hence the need for emotional control. The degree of controlling the particularly strong emotions such as love, hate, anger, surprise, joy, sadness, etc., show the level of achievement of each practitioner of TaeKwonDo.
Emotions should be governed by a strong and conscious reason and aided by experience in principles. The success of application of this tenet in practical everyday life should result in creating the indomitable spirit.