Chandogya Upanishad
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Upanishads
Aitareya Upanishad, Chandogya Upanishad, Isha Upanishad, Kena Upanishad, Mundaka Upanishad, Taittiriya Upanishad
=Notes
'Verily, this whole world is Brahma. Tranquil, let one worship It as that from which he came forth, as that into which he will be dissolved, as that in which he breathes.<ref>Hume, Robert Ernest, trans. The Thirteen Principal Upanishads. Oxford: Oxford University Press, 1921. p. 209 https://archive.org/details/thirteenprincipa028442mbp/page/n7</ref