Yin & Yang
What is Yin and Yang in Taekwondo?
Everything is both empty on one hand and full on the other hand,
so full and empty once fill and empty one another repeatedly into endless changes
of the world and of themselves(Ch.9).
It is you who put them in order and it is Mu-A(No-self) who
completes the harmonious order(Ch.9).
Here, the you and the Mu-A accord with Heaven in SamJae(Three Essential Materials).