Adi Shankaracharya seated among disciples and teaching beside a river

Advaita Vedanta

Shankara

Not one. Not many. Not two.

A disciplined inquiry into the witness, the world, and the error that makes what is indivisible appear divided.

The declaration

सत्यं ज्ञानमनन्तं ब्रह्म।
Brahman is reality, consciousness, and limitlessness.

What knows every change without becoming one more changing thing?

Advaita begins from experience. Body, sensation, thought, and agency are known; Shankara asks what makes that knowing possible and follows the question to the identity of Atman and Brahman.