In a famous passage of the Chāndogya Upaniṣad (3. 14. 2–4), Brahman is described as being “the whole world” and yet spiritual in nature; “life is his body, his form is light, his soul is space,” and he encloses in himself all acts, desires, odors, tastes, etc. But he is at the same time “my ātman in the heart, smaller than a grain of barley, than a mustard seed,” and yet “greater than the earth, greater than the atmosphere, greater than these worlds.”
