Lord Krsna, at the end of the seventh chapter, while describing Him in entirety used the six words Brahma, Adhyatma, Karma, Adhibhuta, Adhidaiva and Adhiyajaa, and explained that Yogis who know Him, in entirety attain Him. For, getting clarification of these six words, Arjuna at the beginning of the eighth chapter, puts seven questions, to Him.
kim tadbrahma kimadhyatmam knit karma purusottama
adhibhutat t ca kiria proktamadhidaivam kimucyate
adhiyajnah katham ko'tra dehe'sminmadhusudana
praysnakale ca katharit jneyo'si niyatatmabhih
What is that Brahma? What is Adhyatma? What is Karma (Action)? 0 Best among men! What is said to be Adhibhuta and what is called Adhidaiva? Who and how is Adhiyajna, here in this body, O Krsna? And how can You be realized, at the time of death, by persons of steadfast mind? 1-2
Purugottama kim tadbrahma:—O Best among men! What do You mean, by the term 'Brahma'?
Kimadhyatmam:—What is meant, by 'Adhyatma'? 'Kim karma'—What do You mean, by 'Karma'?
Adhibhutam ca kim proktam:-What does the term, 'Adhibhuta' mean?
Adhidaivam kimucyate:—What is 'Adhidaiva'?
Adhiyajnah katham ko'tra dehe'smin:—What is 'Adhiyajna', and how is it in this body?
Madhusudana prayanakale ca katham jneyo'si niyatatmabhih:—O Destroyer of the demon, named Madhu, how are You to be realized at the time of death, by those of steadfast mind i.e., by those, who having a disinclination for the world, worship You with exclusive devotion? Which of Your forms, do they know and how?