Everything that manifests in any conceivable way can be said to be the unfolding of a singular source/happening. What the nature of this source is, is unimportant to the point here but let's allow, for now, that it produced a big bang or something similar. So, everything without exception is the expression of this molten universal principle. The formation of the galaxies, solar systems, planets, ecosystems and the complex and sophisticated world of apparent human organisms.
For neutrality's sake we'll call this universal principle xxx. From the perspective of the above, anything thought to be in any way separate from xxx is a form of delusion.
The belief in a self that could be separate, independent and autonomous must be such a delusion. This is not to deny the sense of self that arises in so called self-aware organisms. This sense arises as a seemingly adaptive mechanism and for this reason it's probably not a good idea to try to be rid of it (or to destroy the ego as some religions put it). But it can be seen that this sense of self as with all other appearances is yet another construction in the molten sweep of xxx.
In an intimate way this can be seen right now. It is what is meant when we hear that no one is typing - typing is just happening. Or no one is sitting - sitting is just happening. Right now in this unfolding present (where else?) there is just this seamless molten sweep of Source. The patterns, plays, manifestations and expressions that arise are just this - life happening. Reality being this!
So, seeing through this delusion is a simple and non-mystical thing. Calling it an enlightenment and all the spiritual hoopla that goes along with it is an unnecessary remnant from a murkier credulous time. This is something simple, fresh, alive and in plain view.