Ātman is one of the most important concepts in Vedānta, and one of the most misunderstood. It is commonly translated as "soul" or "self," but both translations miss the mark.

What ātman means
The word ātman comes from a root meaning "to pervade" or "to breathe." In Vedānta, it refers to consciousness -- not your personal consciousness, but consciousness itself.
Key characteristics: - Nitya (eternal): ātman has no beginning and no end - Sarvagata (all-pervading): ātman is not located in a body - Nirvikāra (changeless): ātman does not undergo modification - Asaṅga (unattached): nothing sticks to ātman - Svayam-prakāśa (self-luminous): ātman does not need another light to be known
Ātman is not a soul
The Western concept of "soul" implies a personal, individual entity -- a subtle self that belongs to you and survives death. Ātman is not personal. It is not individual. It does not "belong" to anyone.

Ātman is the consciousness in which the sense of being a person appears. It is like the screen on which a movie plays. The characters in the movie are not the screen. The screen is not affected by the plot. But without the screen, no movie could appear.
Ātman is Brahman
The central teaching of Advaita Vedānta is: ātman is Brahman. The individual self is identical to the ultimate reality. Not similar, not a part of, not connected to -- identical.
This is the meaning of the great statement (mahāvākya): "Tat tvam asi" -- You are That.
Not the person is Brahman. The consciousness that appears as the person is Brahman. The wave is the ocean.
Why it matters
If ātman is your true nature, then: - You are eternal (you were never born, you will never die) - You are limitless (you are not confined to a body) - You are complete (nothing is missing from you) - You are free (you were never actually bound)
Every form of suffering is based on the mistake of taking yourself to be something other than ātman. Correct the mistake, and suffering loses its root.
How to know ātman
Ātman cannot be known as an object. You cannot point to it, photograph it, or measure it. Because it is the subject -- the knower of all objects.
The way to "know" ātman is to recognize that it is already what you are. You do not need to find it. You need to stop identifying with what it is not.
This is the work of Vedānta: removing the confusion (avidyā) that makes you think you are a limited person, so that the limitless consciousness you actually are becomes self-evident.
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