The Gita continually presents a consistent theme throughout the teaching, weaving it through each aspect of the multitude of issues that the Divine Teacher is addressing. This is done so that, from whatever starting point the human disciple looks at the way, the path and the goal, he has to remember and address the highest central truth, and begin to place himself in the standpoint of the divine consciousness. It becomes a tool for reminding the seeker, reorienting the view, and maintaining the focus, regardless of the details, specific concerns or philosophical knots to be untied. Given the propensity of the human mind to continually divide, separate, fragment and analyze, this theme is essential as part of the holistic process of integration of consciousness toward which the Gita is pointing.
Sri Aurobindo describes this theme as follows: “That note was the idea of a supreme Godhead which dwells within man and Nature, but is greater than man and Nature, is found by impersonality of the self, but of which impersonal self is not the whole significance.”
The message of Sri Krishna is explained thus: “See then the one self in all beings that thou mayst see Me in all beings; see all beings in one spiritual self and reality, because that is the way to see all beings in Me; know one Brahman in all that thou mayst see God who is the supreme Brahman. Know thyself, be thyself that thou mayst be united with Me of whom this timeless self is the clear light or the transparent curtain. I the Godhead am the highest truth of self and spirit.”
Sri Aurobindo, Essays on the Gita, Second Series, Part I, Chapter 4, The Secret of Secrets, pp. 291-292