Advaita Vedanta teaches that the individual self is not separate from ultimate reality. Its followers hold that the true self in each person, atman, is the same as brahman, the reality behind everything. “Advaita” means non-dual, and that sameness is the non-duality the name refers to.
The school rests on the Upanishads, and the teacher Adi Shankaracharya later developed it, Punit Kumar and Sanjeev Kumar Varshney write in Philosophy Now.
What brahman is said to be
In Advaita, brahman is infinite and eternal. It lies beyond time, space and change, has no shape or qualities, and is the source of all things.
Why the world still looks divided
Advaita answers with maya. Kumar and Varshney describe it as a power that makes the one reality appear as many, rather than as plain falsehood. Because of maya, people see difference, change and separation where Advaita holds there is only one thing.
Liberation, moksha, comes when a person grasps that their true self is ultimate reality. In the tradition’s teaching, that realisation ends the cycle of death and rebirth.
The problem with knowing yourself
A 2017 paper published by Brill puts the idea to a philosophical test. It compares Advaita with the Greek philosopher Plotinus on a single question: can the self know itself?
The paper’s answer is that both traditions demand the same thing. Full self-knowledge needs a complete absence of otherness. Śaṅkara argued that the self cannot know itself as an object, because a thing becomes an object only once it is set apart from the knowing subject. Plotinus made a parallel point. A mind split into subject and object knows itself as the thing seen, but not as the one seeing.
So, on this reading, non-duality is a claim about knowledge as well as about reality. The paper links the soul’s state at the level of Plotinus’s One to ātman consciousness in Advaita, and calls both expansive and non-dual.
How it differs from its neighbours
Not every Indian school agrees. Samkhya is dualist. It splits reality into matter, prakriti, and pure consciousness, purusha, and it locates suffering in consciousness mistaking itself for changing matter. Its liberation, kaivalya, comes when consciousness sees that it is separate from matter, which is the reverse of the Advaitin move.
Kumar and Varshney go on to set these schools beside quantum physics. Whether that parallel holds is a separate argument, and the Advaita claim does not depend on it.
