In the seventh chapter, Lord Krsna while clarifying knowledge with realization actually He was unfolding the secrets of His heart. But Arjuna put some questions, in between. So the Lord answered his questions and then reverted to the previous topic in the ninth chapter, and concluded it, by advising exclusive surrender, to the Lord. But He was not satisfied with what He had already said to Arjuna. As a devotee wants to know of His glories in detail (Gita 10/18), He also wanted to say something secret to His loving devotee, Arjuna. So, by His grace without being asked by Arjuna, He starts the topic, in the tenth chapter.
bhuya eva mahabaho srnu me paramam vacah
yatte'ham priyamanaya vaksyami hitakamyaya
The Blessed Lord said:-
Once again, 0 mighty-armed, listen to My supreme word, which I shall convey to you, who are so loving, and out of solicitude for your welfare. 1
Bhuya eva:-The knowledge of glories of me Lord, promote devotion. So the Lord by His grace, in the seventh chapter (from the 8th to the 12th verses) mentioned, His seventeen glories and in the ninth chapter (from the 16th to 19th verses) mentioned His thirty-seven glories. Here, in order to tell some more glories and to supplement the glory of devotion mentioned (in Gila 8/14 and 9/22, 34) the Lord uses the expression 'Bhuya eva (Again verily) to explain His devotion in a special way.
Srnu me paramam vacah:—The Lord wants to narrate His supremacy and glories to Arjuna, because he is His devout devotee. So He asks him, to listen to His supreme word.
Secondly, whenever Lord Krsna wants to disclose His secret to Arjuna, He uses such terms, as 'supreme words' etc., as in the third verse of the fourth chapter, he said, "This secret is supreme" because He who taught the immortal Yoga to the sun-god was sitting before him and was driving his horses, and also, in the sixty-fourth verse of the eighteenth chapter, He says to Arjuna, "Listen again to My supreme word" and His supreme word is "Surrendering all duties to Me, seek refuge in Me alone. I shall liberate you from all sins; grieve not" (Gita 18/66). Here, in this context, the Lord says that diverse feelings of creatures, emanate from Him alone and His devotees, such as the seven great seers, four Sanaka etc., and fourteen Manus were born of His will i.e., He, is the root of all of them.