As the mind rocks back and forth between seeking something objective, to looking within and finding nothing at all, the spiritual search is like a journey. The quest is to come to know this "state" of peace, this final situation where I no longer suffer.
We investigate the sense of Self to no avail - because we're forever trying to objectify it. That's what the mind does. It's job is to objectify, to classify, to divide. The mind is itself the engine of duality.
As we watch the mind, tossing and turning, bouncing off the walls, analyzing paradox with a sharp intellect, there may come a sense of frustration and confusion. This is natural because the mind can never figure out that which is beyond it's scope - beyond it's capabilities. Any understanding that could come can ONLY be a conceptual understanding, because understanding happens in mind.
So can we get out of mind? Can we make it stop? No. We either remain locked into identification with this duality machine or we realize that what we are is already beyond. There is no process to becoming NOT mind, because what you are is already NOT mind.
And this isn't a milestone, not an achievement - it's recognized to be the case already. The fact is that you do nothing but describe thoughts, describe states of mind, describe concepts and ideas. The only way this can happen is if you are already prior to mind, observing mind - what you are is the background on which mind plays.
So as this swirling mind runs about - bouncing around, circling over and over - there comes a sense of futility and frustration at the mind. It wants to take apart everything - analyze it - break it into parts and see how it works, like a small child with a new toy. At some point this activity may pause.
And in that pause, in that mental sabbatical from the search, the slightest thing may be seen - a sunrise, a face, a tree - without that engine raging, without the automatic and habitual conceptual creation of the insistence of subject and object, no one can be found to be looking at a tree. No tree can be found - there is only the looking, only the present THIS-ness, before the mind can rebound and come rushing in to split it all up.
It is in the abeyance of mind which brings the absence of the idea of separate self-ness. It is in the absence of thought where duality falls away as mirage. And then it comes rushing back.
Is this a failure? Is this just another sign of your continued failure in the spiritual search. No! In this, it may be seen that it is the mind itself which creates this idea of "thingness", of separation, of subject-object, of "someone" looking and a "tree' to be seen.
While mind was absent, there was no tree and no looker. Even calling it looking or knowing or awareness was too much. There was only the immediacy - the totality - which included the absence of mind and presently includes the presence of mind. Once mind returns that engine of duality is back hard at work. But it is no longer spellbinding. The mechanism has been recognized. The snake is seen to be only rope, and no matter how many times we turn out the lights, we can never again really be fooled by the shape of "snake".
Recognize that it is only the idea in mind of "thingness" which creates the idea of separation, subject-object, etc. And even if mind is actively dividing everything, analyzing - the idea that it's a separate mind or "thing" is another one of it's products.
Right now, just pause thought. As often as you can, just pause thought. Pause the incessant activity to figure it all out, to solve the "advaita puzzle". It doesn't need to be figured out. In that pause, no idea of becoming is there. No idea of separate self is there. No idea of thingness is there.
All that is there is indescribable being.