It is inevitable that there is Man between Sky and Earth whenever the both are given because the they are to be divided from one whole as Man exists. The category of Sky includes everything that changes relatively, i.e. that has no shape on itself while the category of Earth includes everything that is fixed relatively, i.e. that has concrete figure about it. These categories can be divided such like that only based on the distinguishing subjective, which belongs to the category of Man. The distinguishing subjective is the will as intending to do something.

TAEKWONDO is not exceptional that it is also composed of these three materials, and it is important that you should always keep yourself as what you are without being biased to an extremity in a battle against your opponent, which is the third principle, called "the way of Man". Another people have said of this the knowing yourself, or the keeping to your sphere, or the golden mean. To say differently, the way of Man in Taekwondo is to return immediately to a settled pose which is the core of each motion of yours in perfect balance despite endless changes and motions, or to make your position firm staying in your complete balance and stability.

A Taekwondo man along the way of Man always keeps himself in enough training and intense preparation so that he never loses his own way at any moment of Kyorugi. It is a sort of realm of his life. He can be confident since he can control over everything in the realm, and so he never loses predominance over others at all since he includes others in the realm. After he broadened the possibility of his position-keeping infinitely he can rather erase the predominance and get everything relying on the opponent's motion. This is possible because only after he knows existence of 'I' first he can know nonexistence of 'I'. It is essential for life that every living thing manages all of its process and activity in order to save itself, and man is a life, and therefore, the way of Man is naturally closest to the figure of life among those three.

A plant begins as a seed and makes its roots and leaves, blooming a flower, then ends up as a fruit, which contains many seeds again. All of these changes are due to that all of them, i.e. a seed, a big tree and everything else, are nothing but a kind of plant breathing together with the whole nature from the deep root and many leaves. Otherwise, a seed would spoil to be a mere piece and a big tree would be nothing more than a lump of wood. They would stop changes of a life, growing no more.

Through all of these temporal processes the core is its "being a plant", and in space the core is the earth where it roots. The strongness and weakness can be only in such being alive, and the strongness is not different from a life's growing. This is the form of everything's change. The principle of Taekwondo is same with that of Nature.

The core, refered in the way of Man, means your own perfect pose which allows most possibility to adapt yourself to each situation. It is the true figure of each Taekwondo man. You should return to your core naturally and immediately from each movement. This implies that you don't leave your core, but just extend yourself to various figures contracting yourself back to the core.

Since this core is each man's figure of practicing Taekwondo it is not fixed at all while it will be determined by the relation of your and your opponent's motions, weapons, distance and so on. This fact is due to that you make endless change in nature. Since, however, this principle is no more than an aspect of Taekwondo and everybody cannot but follow its right principle it is fixed in abstract level.

This structure of this change lies in everything changing that man conceives intentionally. Let's take a toytop for an example. Since the toytop will be troubled in its spinning with its swaying core when it spins, its core that manages each change should be stable and firm. Once its core were stable and firm it could spin on any place and stand in any situation.

As each part of the toytop turns swiftly back to its core your motion should turn back to your core, i.e. to your balanced pose and position swiftly. Only the core of change can link a change to another naturally. Accordingly, whenever you kick you should drop your foot down right away back to the original pose, which makes the next skill possible naturally and swiftly. All the same with skills of hands.