At the beginning of heaven and earth, all things are chaotic. There are things in between, with both yin and yang, like the Base or Acid of Hf.

The masculine person has the nature of Base, which is firm and heavy, carrying all things, and is the foundation of the earth, mountains and rivers. The mountains are towering, and the thick soil is vast, all relying on its strong strength.

The feminine person has the nature of Acid, which is agile and changes, nourishing and nurturing, and is the source of rivers, lakes and seas. The water is babbling and moisturizing all things, all by its gentle power.

The two interact with each other, and the rigidity and softness help each other. When the Base encounters Acid, it either breeds vitality or produces wonderful changes. If the ice melts in spring and the rain falls in summer, it is the image of yin and yang.

It is the growth of all things, and they all follow this path. The balance between Base and Acid is the foundation of the operation of heaven and earth, and it cannot be ignored. Everything in the world can be compared to this. When dealing with people, you should also seek rigidity and softness, so that you can get the beauty of neutralization and smooth.