"Six in the Third Place" down to "without completion, there is an end." Zhengyi says: "Concealing brilliance, one can persevere": Six in the Third Place dwells at the culmination of the lower trigram, yet is able to avoid being suspected by yang. "Brilliance" means beauty.
Dwelling at the culmination of yin, it can humble and withdraw itself, not initiating affairs, but merely containing within itself the way of brilliance and beauty, waiting for the command before acting, which allows it to attain uprightness; hence it is said: "Concealing brilliance, one can persevere."
"Occasionally following the king's affairs, without completion there is an end": saying that Six in the Third Place acts as a minister, occasionally complying with the king's affairs, so it does not dare to be the head of affairs or claim the completion of things, hence saying "without completion."
It merely responds to the superior's call and carries out the end, hence saying "there is an end." Commentary on "The third line dwells at the culmination of the lower trigram."
Zhengyi says: "The third line dwells at the culmination of the lower trigram" wishes to show that although the third line is a yin line, its position is honored.
"Not suspected by yang": the honored culmination of yin is about to rival yang, and its substance would surely be resented by yang; now, not being suspected by yang means yang does not harm it.
"Accords with this principle": "this" refers to the principle; if one can accord with this principle, solely practicing the affairs from "concealing brilliance, one can persevere" downward, then one accords with this principle.
This line illuminates meaning entirely through human affairs.