If there is one word that summarizes the entire teaching of Vedānta, it is Brahman. But what does this word really mean?

Meaning of the Word
Brahman comes from the root "bṛh" -- to expand, to grow without limit. Brahman is that which is limitless, infinite, without boundary. It is not a being that lives somewhere. It is existence itself.
Brahman Is Not a God
When someone hears "absolute reality," they picture a god sitting on a cosmic throne. That is not it. Brahman is not a person, a being separate from the world. Brahman is the substance of everything.

The Upaniṣads use the analogy of clay and pot: the pot has name and form, but the substance is clay. In the same way, the universe has infinite names and forms -- but the substance is Brahman.
Sat-Cit-Ānanda
The sages describe Brahman as sat-cit-ānanda: - Sat -- pure existence, that which never ceases to be - Cit -- consciousness, the principle of knowledge - Ānanda -- fullness, absence of limitation
This is not a definition -- because Brahman is beyond definitions. It is a pointer. The Upaniṣads say "neti, neti" -- not this, not this. Brahman is what remains when you negate everything that is limited.
And You?
Here is the radical part: the Upaniṣads state that Brahman is ātman. The absolute reality is your own self. Not the ego, not the personality -- but the consciousness that is the basis of all experience.
"Tat tvam asi" -- You are That.
Why This Matters
If Brahman is your nature, then the fullness you seek is already what you are. You do not need to conquer anything. You need to remove the ignorance (avidyā) that hides what has always been there.
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