Our conceptual minds (and language) operate in terms of differentiation, and learning those distinctions, categories and labels like: red blue, colorflavor, squareround, happysad, bodymind, hungryfull, selfenvironment, etc. is necessary for communication and survival, but is also a conditioning of limitations. Once a child grasps the concept/label of "bird" they may never see what that manifestation actually IS (free of any distinctions or labels).
It IS also possible to recognize that within which all of those distinctions exist, which is beyond the limitations of time, space, self, experience, and other. Yet the temptation is to ALSO make that a category, a nice finite "box of unknowable mystery", separate from all that which can be described, then discuss it conceptually as if that was satisfactory.
We create words and phrases to try to point that way: "nonduality", "Awakeness", "Spirituality", "God", etc. but any concept/word can only aspire to point beyond itself.
The signposts that have been left along the way are only clear once we pass them and look back. There is no suffering there.