All the sages proclaim that the only Absolute Truth there is, is "I". Not even "I am" because that implies existence which may or may not be true, but "I", the inexpressible and undefinable God/Reality/Truth/Tao/Subjectivity that allows anything to even
be. All sentient life with self-awareness can express this Absolute Truth of "I", but everything else is just the mind's concepts/assumptions.
We take so many things for granted, like why are we even here? How do I even have this awareness, this consciousness? How are we even able to be here, discussing this topic, and questioning our own existence? Science just says, "well there was the Big Bang, and then there was evolution." What allowed for the Big Bang, and what allowed for evolution?
The main principle of Advaita Vedanta is that of non-duality, which is that whenever you have any kind of division at all it is the mind's concepts superimposing themselves over the true reality. What happens in non-duality is that there is no objectification possible. Any objectification means that there is a split between subject/object, which is a concept and cannot be the Absolute Truth. Yet, we are aware of our awareness, and that there is a "subject" that is aware of everything. The paradox is that in assuming there is a subject, it splits Reality into subject and object, no matter how deep you go within. The only way out is to realize that the subject is what is objectivising itself, i.e. subject does not even exist, the supposed "subject" is actually only subjectivity -- and it is the same as "I".
Not sure if that made any sense
I took these ideas from Wei Wu Wei's books, highly recommend them if you enjoy giving yourself huge headaches
