Srimad Bhagavadgita Sadhaka Sanjivani -Swami Ramsukhdas
It means, that there is nothing else, at the beginning, in the middle and at the end, besides the Lord. The Lord pointed out this fact, first in the twentieth verse then in the middle in the thirty-second verse and at last in the thirty-ninth verse, by declaring Himself as the seed of all beings. It means, that all is God (Gita 7/19). He has also declared that He becomes manifold in different forms (Chandogya. 6/2/3) and He remains at the end, also (Srimadbha. 10/3/25). It means that He is in the middle also. In this verse, in the thirty-second and thirty-ninth verses, the Lord has mentioned His main glories, referring to Himself. In other verses, His glories have been mentioned as the head of a class, the controller of the group, or due to some special characteristic of that glory. So, a striver should always think, that all the divine glories are nothing, besides manifestations of the Lord. He should behold only God, in all of these, because Arjuna put the question, "In what aspects are You to be thought of, by me" (Gita 10/17).