The ego is a mental construct mistaken for the self
Tolle's foundational claim is that most people unconsciously identify with a mental image built from thoughts, memories, roles, and possessions — the ego — and mistake this construct for their actual identity. The ego is not evil, just fundamentally confused: it treats its own story as reality itself.
This matters because the ego, by nature, is insecure — since it's just a mental construct with no independent substance, it constantly needs external validation, comparison, and reinforcement to feel real, which is precisely why so much human behavior involves defending opinions, chasing status, or needing to be right.
Tolle's larger claim is that beneath this constructed identity lies a deeper awareness — consciousness itself — that doesn't need any of that defending, because it was never actually threatened in the first place.
Takeaway: notice how much of your reactive behavior is really the ego defending a story, not you defending a fact.