The Xiang Er commentaries are an important early commentary of the dao de jing which is often attributed to the Tianshi/heavenly teacher sect of religious daoism. It is a self cultivation text and is based on fixing ones on shortcomings in order to join with the dao.
This section discusses concepts which would later come to great importance in Daoist meditation practices.
和其光，同其尘。」情性不动，喜怒不发，五藏皆和同相生，与道同光尘也。
Harmonize the light,
Together with the dust:
The emotions and true nature do not move, affection and anger do not emerge, the five organs all harmonize and come to life. The Dao is together with the light and the dust.
「湛似常存。」如此湛然常在不亡。
Clear, it is long held:
Like this, remain clear ongoing, and do not forget.
「吾不知谁子，像帝之先。」吾事，道也。帝先者，亦道也，与无名万物始同一耳。未知谁家子能行此道，能行者便像道也，似帝先矣。
I don’t know whose child it is, it seems to be before the image of God:
The meaning of “I” is the dao. “Before God” also means the dao. All beings begin without a name
He who does not know his own origin can move with the dao. He who can do this can change to the image of the Dao. This is the meaning of “before God.”