The Holy Bible is made up of two testaments: the Old Testament and the New Testament. The Old Testament is Yin, the New Testament is Yang, and the Holy Bible is Yinyang.
The Holy Bible is where the Old Testament and the New Testament are reconciled. It is where Yin and Yang unite to form Yinyang.
Yin is curse or conflict and Yang is blessing or peace. The Old Testament is Yin Yang because it is about the conflict between the curse and the blessing. It is so polarized that the curse is one extreme and the blessing is the other extreme. And the blessing couldn't manifest because of the opposing effect of the curse.
Yin dominates or rule wherever there is an opposing effect of Yin and Yang. And Yang dominates wherever there is a complementary effect of Yin and Yang. Consequently, Yin reigns in conflicts and hostilities and Yang reigns in peace and reconciliation.
The Old Testament is about the opposing forces of Yin and Yang, and the New Testament is about the complementing effect of Yin and Yang. Yin and Yang are transformed into Yinyang when the complementary effect is aligned with the opposing effect.
'Yin Yang' becomes inferior or subject to Yinyang when the complementary and opposing forces are united.
The octagonal Bagua is inferior to the Taiji because the Bagua is 'Yin Yang' and the Taiji is Yinyang. The Bagua is the Old Testament, Taiji is the New Testament, and the Taiji inside the Bagua is the New Testament placed on the Old Testament. Here, the New Testament and the Old Testament are two separate books.
The two squares constituting the Bagua are the two conflicting and opposing forces of the Old Testament. The first square is the curse and the second square is the blessing. But the cubic Bagua is equal to the Taiji when the two books are united to form one book. The Holy Bible reflects the New Testament because the Old Testament was transformed into the New Testament when the Bagua became a cube like the Taiji.
Therefore, the Holy Bible is a cube made up of two cubes. The first cube is the Bagua (the Old Testament), the second cube is the Taiji (the New Testament). Bagua (the Old Testament) and Taiji (the New Testament) are at equilibrium in the Holy Bible, and the equilibrium is Yinyang.