(Mahāvākya): The four “Great Sayings” or “Great Affirmations” of the Upanishads, which indicate the unity of atman (the individual essence) and Brahman. The sayings are:

  1. Prajnanam Brahman, “Consciousness Is Brahman
  2. Ayam Atma Brahma, “The Self [Atman] Is Brahman
  3. Tat Tvam Asi, “Thou Art That”
  4. Aham Brahmasmi, “I Am Brahman