What is Enlightenment?
There are all sorts of concepts about what it is, even the concept that Enlightenment has a purpose - to make ME feel better, to make ME more peaceful, more happy, more blissful, permanently wise and free.
Stripping away all the nonsense - Enlightenment is Annihilation. Annihilation of the self. Is this what you REALLY want? Is this what you're REALLY searching for? If you knew it was the annihilation of the self, instead of just making MY life better, would you really spend all the time and money reading books, visiting teachers, sitting in meditation?
So Enlightenment is a goal - something "I" need to do to "attain" Enlightenment, then "I" will be a better person, have a better life, be happier and more at peace. Then "I" will understand all the mysteries of life.
But Enlightenment is the annihilation of the self - totally wiping out the self. There is no one left to be happy, no one left to be at peace, no one left to have a better life.
But annihilation of the self doesn't mean that there is this "self" here now, and then LATER the self is annihilated. This is TOTAL annihilation - the realization that there NEVER WAS a self, NEVER WAS a ME that could have these things in the first place. Enlightenment means there NEVER WAS anyone there to become Enlightened in the first place, NEVER WAS a seeker, NEVER WAS a "person" who was suffering, NEVER WAS anyone who needed or wanted peace or happiness or a better life.
Total annihilation - is this really what you want? No "person" would ever want this. No "I" would ever want the "I" to be annihilated, to see that the "I" was only ever a concept, a thought. No ME would ever want ME to have never existed. No "mind" could ever envision or conceptualize it's very non-existence.
So annihilation never happened or could happen, because there is nothing to annihilate, no one to BECOME non-existent, no ME to lose. Enlightenment was only ever another attempt by the mind to make this life story "better", to alleviate suffering caused by the reference to something which never existed in the first place.