In normal everyday usage, "I" embodies the primordial error, a misperception of who you are, an illusory sense of identity. This is the ego. This illusory sense of self is what Albert Einstein, who had deep insights not only into the reality of space and time but also into human nature, referred to as "an optical illusion of consciousness." That illusory self then becomes the basis for all further interpretations, or rather misinterpretations of reality, all thought processes, interactions, and relationships. Your reality becomes a reflection of the original illusion.
— Eckhart Tolle