8. aitareya Upanishad:
The taittirIya Upanishad concludes with the ecstatic Vedic chant (sung by realized Sages) that “I am food; I am the eater of the food.” Here, “food” is not merely what is eaten from a plate. Whatever is consumed is food. The four elements—earth, water, fire, and air—are served to us on the vast platter of space. We consume them directly or in the countless forms they assume.
Our consumption is not merely through the mouth. The mind also feeds continuously. From birth until death it devours impressions, memories, relationships, possessions, emotions, hopes, fears, and ideas about this world and even other worlds. All these constitute food for the mind.
Thus, “food” in the mantra stands for the entire field of experience. The eater is the individual (jīva); the eaten is the world. In Vedāntic language, the eater is the knower and the food is the known. Everything cognized belongs to the world of names and forms.
The Upaniṣhad therefore ends by bringing together the knower and the known and declaring that both are included in “I.” Hence the sage proclaims, “I am the world and I am the individual.”
When both the individual and the world dissolve into “I,” no boundary remains between them. This naturally raises the crucial question: Who or what is this “I”?