The Four Eternal Mahavakyas (Great Sayings) from the Upanishads:
pragñānam brahma - "Consciousness is Brahman" (Aitareya Upanishad)
ayam ātmā brahma - "This Self is Brahman" (Mandukya Upanishad)
This Anthology of Ten Primary Upanishads contains the wealth of wisdom of the ages. Now available in hardcover, paperback and e-book formats.