Rebirth occurs when our consciousness (vijñāna) attaches/interfaces with the fertilized egg (nāmarūpa) so that a zygote is formed which is under the process of rapid cell division. During this process of division consciousness becomes more and more embodied or incarnated. After birth it is impossible to tell that our consciousness is prior to this physical form of ours with its eventual 37.2 trillion cells, all of which are interconnected through consciousness.
Our body has become us and we are this body or so it would seem. Still, we have to remember the importance of how we got into this situation in the first place. Consciousness attached to, and thus interfaced with the fertilized egg and its ongoing division. The fact of this interfacing is of crucial importance in the enlightenment/liberation process. Enlightenment is a sharp—but brief—clean break from our attachment to the body’s 37.2 trillion cells!
This sudden break for us consisted in overcoming consciousness; its implicit doubleness (dvaya) by which this illusory world is exhibited which appears real to us. This may explain why in the Lankavatara Sutra the Buddha says: I enter into nirvana when the vijñāna which is caused by discrimination ceases.
Only with the sudden realization of tathāgarbha which is single, not double; which is often equated with buddhadhātu (the element of awakening), does such discrimination cease. As I have pointed out before in other blogs, when the pure subject meets the pure object only then does the dual nature of vijñāna come to an end but only long enough to merge with the buddhadhātu or tathāgarbha. As a result, spirit is beheld which is absolutely universal and non-dual (advaya). All illusion falls within it, even vijñāna together with its phenomena. This was not so before our enlightenment. What has been primordially hidden because of consciousness is now revealed.