金剛三昧經論 2.69

2.69

論曰：此下第三如來放光表讚菩薩。於中有二：先經家序。所以放大光明照大千界者，為表得大智慧光明，照世間闇令得光明故，證成如來前所讚故。大哉菩薩者，別讚無住菩薩。智慧滿足者，以無所知無所不知故。於四威儀常住本利者，如前所序從遠近來親如來座，因此示現本覺利故。不來去去者，寂而恒化故。言不來者，隨所導化令得出世不退還故。言去去者，隨得不退展轉出離而善逝故。

The commentary says: From here on is the third [section], the Tathāgata emitting light to indicate and praise the bodhisattva. Within it there are two [parts]: first, the sūtra compiler's preface.
The reason he emits a great light that illuminates the great chiliocosm is to symbolize the attainment of the great light of wisdom, illuminating the darkness of the world to cause it to attain light, and thereby confirming what the Tathāgata previously praised.
'Great indeed is the bodhisattva' specifically praises Bodhisattva Apratiṣṭhita.
'His wisdom is complete and fulfilled' is because there is nothing he knows, yet there is nothing he does not know.
'In the four postures, he constantly abides in the original benefit' is as previously introduced: coming from afar to draw near to the Tathāgata's seat, through which he demonstrated the benefit of innate awakening.
'Not coming, yet going and going' is because he is tranquil yet constantly transforms [beings]. 'Not coming' means that in accordance with his guidance and transformation, he causes them to attain transcendence of the world and not regress. 'Going and going' means that in accordance with attaining non-retrogression, they progressively transcend and depart, thus being well-gone.