Believing you are a person with a brain/mind who thinks and understands that nothing can be known or understood is not the same as realizing there is no one and no mind to think or understand, or not think or not understand. The beliefs of existing as a personal and separate self are what gives rise to the idea of having “a mind.
Perhaps the idea that you are a separate being with a personal brain/mind will be seen as the misperception it is.
Of course, seeing this…intense fear often arises…which is the egoic mind at work creating and reinforcing the sense of being an individual self, reasserting itself, not wanting to yield to the appearances of an infinite and edgeless aware presence.
Yet, the mind/ego can’t choose its own annihilation. Thankfully, it’s not up to “the you you believe you are” to correct this misperception. Thinking…simply…appears…uncaused, just like breathing, just like clouds appearing upon a vast sky. Thinking is not a problem. Believing thoughts to be real and belonging to a you is what brings personal suffering.