The last stage of kundalini awakening is when the kundalini reaches Crown chakra also called Ajna chakra. At this moment our brain becomes 100% active. There is nothing more left to be achieved in this world. One finally becomes knower of all, becomes a kaivalya jnani.
The activation of brain at a faster pace occurs not by bookish intelligence or anything that relates to ephemeral world. Brain activates faster only when we indulged in spiritual activities life self enquiry, Neti (not this, not this) a path through which we dissolved queries within.
Spirituality was all about dissolving all queries within, queries that had a spiritual connotation. Queries like who am I, where did I come from, what is the goal of my life, am I a body or a soul, my relationship with God and other souls atmans… definition and inner meaning of spiritual terminology life karma, dharma and biggest of all separating spirituality from religion.
I started in pursuit of God six years of age still indulging in contemplation (chintan) most of time I took above seven years to realize the underlying difference between dharma, religion and spirituality. These terms are not that easily understood. Understanding the true meaning of these words itself, means reaching the end of cosmic life!
Around 12 to 13 years of age my spiritual progress multiplied like anything. Thereafter it was never looking back. My indulgence in contemplation grew by leaps and bounds. While going to bed in night and lying in shavasna pose of yoga I indulged in contemplation in subconscious state. At that time I had many queries within. In the morning when I got up all queries had dissolved forever. In the morning I was on a totally different plane experiencing ecstasy, infinite bliss.
As my journey of spirituality progressed so did the awakening of kundalini within. Unmindful of what was happening; I just continued indulging in spirituality to the best extent possible. I wanted to dissolve all queries within in the fastest possible span of time.
Slowly I reached stage of Nirvikalpa samadhi (when not a single thought entered our brain uninvoked). My practice of absolute celibacy exceeding 14 years had been successful. And all of a sudden in the wee hours of third of August 1993 my kundalini reached the Crown chakra. Immediately Sahasra Pushpa (thousand petalled Lotus) existing in brain behind forehead opened fully. The last block of queries dissolved forever, I finally experienced state of full kundalini awakening, 100% activation of brain in totality.
Thereafter everything contained in Bhagavad Gita even Upanishads (independent spiritual treatises) became like ABCD, it was as if I had dictated the contents of these sacred texts in one of my previous manifestations. By grace of God I had finally reached the end of cosmic life.