What is the meaning of “He who attains One is a Saint?”

Wu-ji¹¹ is the origin of Tao, and Tao is the origin of One. 

When Wu-ji changes from the ultimate quiescence, One is

generated.  This One then multiplied and evolved into the

cosmos and everything within.  So when Heaven has One,

it becomes clear and pure.  When Earth has One, it settles

quietly.  When a man has One, he becomes a Saint.

The five great religions all emphasize One.  Buddhism

emphasizes on brightening the heart to see the True Self so

that all Dharmas return to One.  Taoism emphasizes on

cultivating the heart to refine the True Self so that one

embraces the Origin and maintains One.  Confucianism

emphasizes on holding the heart to cultivate the True Self

so that one can hold fast to the centre and pervade One. 

Christianity emphasizes on purifying the heart to align to

the True Self so that one can pray in quiescence and be

close to One.  Islam emphasizes on strengthening the heart

to stabilize the True Self so that one is purified and return to

One.  The Saints of the five religions preached the practice

of returning to One.  Returning to One is the same as returning

to the Heavenly Kingdom of God.