"How can I succeed in attacking my opponent?"

"... Don't intend to injure him."

Have your opponent opposed to the world harmonizing yourself in it; This is called "the way of Tang(Earth)", which is the right principle of every technique in Taekwondo. You can find everything of TAEKWONDO in this, so it is also the way of right thinking in Taekwondo. While the way of Haneul(Sky) is a principle focusing on the originally nondistinctive essence of Nature, the way of Tang(Earth) is focusing on the man's originally distinctive essence, yet both of them imply same, i.e. one thing.

Following the way of Tang can be considered in three dimensions, each of which is called respectively following <Sool(technique)> <Yae(art)> and <Do(principle)>. Everyone, however, should know that each of these is ultimately same with one another as different aspects of a thing, so they are just distinctions of what is not distinctive.

Then, what is following <Sool()>, <Yae()> and <Do()>? First, following <Sool> is surpassing opponent with perfect technique of Taekwondo, i.e. facing opponent with Musool. Second, following <Yae> is expressing perfect self in development of technique for technique itself, not attached to opponent, which includes the opponent too, so it is facing opponent with Muyae. Third, following <Do> is having both Musool and Muyae in one to transcend this distinction of discerning opponent from you, so it is facing the whole with Mudo.

Although your opponent's will always moves him it is your will that determines your opponent's. Man's motion should have its own will first, then it can have its power. While power is such a sharp and hard thing as able to break a rock, the will is something soft so that it changes and applies itself to the shape of the world. Accordingly the soft can surpass the hard.

That your will controls everything and that everything is expression of your mind so that <Yae> and <Sool> are united into one, which is the art. That is, the art is the unity of <Yae>, which is the right expression of your will, and of <Sool>, which is the technique of controlling the world.

These various changes and harmonies are possible only because there is what does not change at all from beginning to end despite changes of everything, and this nochanging is the root of everything under each change, the name of which is <Do>. Thus, <Do> is what makes everything such like that, so it is one undistinguishable principle that supports every distinguishable consistently. This exists neither in nor out of everything, yet everything depends on it, so it shows itself to anyone whoever he may be and whenever he opens his eyes and deletes unnecessary distinctions.