Mahavakyas
The Mahavakyas - Great Utterances   ‘prajnanam Brahma (‘Consciousness is Brahman’), from Aitareya Upanishad, reveals the nature of the Self;    ‘aham brahmasmi’ (‘I am Brahman’), which is found in the Brihadaranyaka Upanishad, reveals the source of the enquiry;    ‘tat tvam asi’ (‘That Thou Art’) is found in the Chandogya Upanishad; this is the statement Guru Ramana reiterates again and again.    ‘ayam Atma brahma’ (‘This Atman is Brahman’), this is found in the Mandukya Upanishad; this  identifies our very Being with Brahman.