4.4 Arjuna inquired from the Blessed One: “But you were born long after Vivasvat. How could it be possible that you taught this Yoga in the very beginning?”
Arjuna is judging Krishna only by his present incarnation. The Blessed One expounds in the next verse the nature of his Omnipresent Consciousness that is timeless and boundless.
4.5 You need to Recollect, that we both have passed through innumerable reincarnations. You have forgotten yours, Arjuna; but I remember them all.
For most sentient beings, memories of past lives do not rise to the surface of their consciousness. In some fashion, due to the overwhelming burden of having to bear vast consecutive memories, some just too horrible to imagine, the inconceivable compassion of the Divine Absolute extends a vast veil of endless forgetfulness—a compassionate anesthesia—over the ordinary mind. On the other hand, for the Divine Avatars such as Krishna and even Gautama Buddha’s spirit, as soon as the moment of Liberation (Enlightenment) occurs, vast memories of past lives and associations can flood to the surface of consciousness—witness the Buddha beneath the Bodhi tree being able to recall all of his former lives. Not only this, but the Blessed One reassures Arjuna that together they have shared other past lives together.
As a side note, have you ever wondered that you, too, in some fashion are now re-experiencing some past form of spiritual encounters? I seem to recollect Tozen sharing many years ago in his school that we (students) could very well be re-experiencing some past association. Good food for thought.
4.6 The Truth is I am Unborn, Uncreate, and Undying; my Omniscient-Spirit is the Lord of all creation, yet through my natural-outflows I am also able to manifest in sundry fashion.
This is the Divine Absolute Spirit speaking Ex-Spiritus (in the name of the Immortal Spirit). Even though now in the form of Krishna, the Unborn One is revealing a profound truth—that even before Arjuna ever was (regardless of the number of his incarnations) the Unborn Mind Itself is prior-to all manner of formal manifestations.
4.7 Whenever the Sacred Dharma is in decline and the inevitable Dark Chaos prevails, I will then once again send-forth my Self to intervene.
Truly a prophetic voice, one in which is presently manifested through the form of Krishna. Tozen, in his Dharmakaya Sutra, has Maitrya descending from the Tushita Heaven to engage the vast assembly in the hall of Sambhogakaya. His role was to herald a “final revelation in the Dharma-Ending-Age”—to help awaken the Undivided and Nirvanic Union of Mind within the Dharmakayic-Self.
4.8 In such fashion, my Noble Spirit takes rebirth in sentient-form in order to protect those who are devoted to the Dharmatic-Truth, to discredit the evil-one, and to raise the Banner of Noble Wisdom as a sign that the Nirvanic Kingdom is at hand.
In this vein, the Absolute-Spirit-Self returns again and again to reignite the Flame of Noble Wisdom that enlightens the way home for the lost wayfarers of Nirvanic Truth.