The mind is the size of the universe, and the body is the size of the earth. This is my understanding of the people of heaven and earth.
Whoever has a mind beforehand can have a body. Whoever has a heart can do it.
Body and mind are yin and yang. There is no mind, body, and body, and no body and mind. This is the mutual root of body and mind.
Practitioners who grasp the mutual roots of body and mind are the foundation of practicing tai chi. It is the greatest yin and yang of the human body.