There are very few people that understand that and even fewer people that have made that connection at the conscious level.
There are numerous accounts of the past in which this connection has been made.
Finding out who you are, the true original nature of “I“ was enough to awaken you at a higher level of conscious connectivity.
The sudden realization of the true nature of reality would trigger a chain reaction in which the illusion of the material world would collapse and the individual would be freed from the prison of reason reestablishing the natural supremacy of the Spirit over the Ego.
The Zen literature is full of accounts of people, Zen students, that have attained enlightenment, spiritual awakening or Satori, by simply breaking through the illusion of separation and understanding the nonduality nature of oneness.
It looks like that type of awakening is not possible any longer in our times.
I’ve never encountered or heard about another alive human being enlightened at the present time with the exception of few momentary spontaneous enlightenment, the most notorious and documented being the so-called “near-death experience” which I like to call more appropriately “near life experience”
But even these spontaneous enlightenment experiences were not powerful enough to create a permanent conscience change and reverted after a short time to the Ego-consciousness prior to the event, leaving behind only the memories of the awakening.
That means that even for the people that have broken through the illusion of the material world and have made a total connection with the spiritual world at the conscious level, the awakening wouldn't last very long before reverting to the Ego reality set of mind.
This situation is the result of a very strong Ego dominance over our thinking that has exponentially grown in intensity in our time.
Zen Buddhism developed in Japan in the 8th century in a medieval society.
Since then the world has become increasingly more interconnected and interdependent.
New modes of transportation and communication have made our world shrink. It took years to circumvent the world, and about as long for the news to propagate.
Now going around the globe has become a matter of hours and the news is transmitted at the speed of light to any corner of the globe. In the last decades, the information revolution has connected us 24/7.
We are practically going to bed with our phones and waking up with our phone in the hand. On top of that, the complexity of our social and economic life has also increased. We are in a situation that our brain is overused and have no free time left in the day. Paradoxically all this development has not brought us together but contrary has made us more isolated from each other and tied us stronger to the Ego material world.
You have to physically break away from any social interaction in order to escape the chains of entanglement.
As long as you are a part of the social system, being in this world but not of this world has become an impossibility.