Chandogya UpanishadThe Chandogya Upanishad is one of the principal Upanishads and a major source of Vedantic teaching. Combining symbolic meditation, sacred chant, cosmology, ethics, and nondual insight, it gradually leads the student toward the truth of the Self and Brahman. It is especially celebrated for the teaching “Tat Tvam Asi” — “That Thou Art” — one of the great declarations of the Upanishadic tradition.Book link ↗