You are that

In the eighth century a young philosopher in southern India named Shankara walked the length of the subcontinent, debating every school of thought he met, and gathered the oldest Indian scriptures, the Upanishads, into a single teaching. It's called Advaita Vedanta, nondual Vedanta, and its whole message is in three words from the Chandogya Upanishad, spoken by a father to his son: tat tvam asi. You are that.

That, in the Upanishads, is the absolute, the ground of everything, what some traditions call God and others call awareness itself. The teaching is that the self you take yourself to be, the small, separate, anxious one, is a misreading. Underneath it, the self and the absolute are not two.

I hold this one as philosophy, the way I hold the Gita, and I'll say that whether or not you believe the metaphysics, the practice does something. On day seventy-seven you asked "who am I?" and looked. Shankara's teaching is what the looking finds, or what the tradition says it finds: not a thing, not a self with edges, but awareness with nothing separate in it.

His method was discrimination: neti neti, not this, not this. I am not the body, which changes. Not the thoughts, which come and go. Not the feelings. Not the roles. Strip away everything that changes, and what remains is what you are.

It's in the month of Awareness because it's the chamber's furthest edge. The month started with noticing thoughts. It ends, in this key, by asking whether the one who notices has any boundaries at all. You don't have to answer. You have to look.

Shankara, for all his philosophy, left a practical line: the world is like a rope mistaken for a snake in the dark. Nothing changes when the light comes on except that you stop being afraid.