In the traditional Hindu pantheon of gods, Agni is the god of fire. He is praised in the Upanishads as one of the first gods to gain awareness of Brahman, along with Indra and Vayu (53).

One of the Prana or regions of the human body, apana is the “lower regions” (70). It is associated with earth.

One of the key spiritual concepts in the Upanishads, the Atman is the eternal self or individual soul. It is also considered part of the greater universal unity of Brahman. Through knowing one’s Atman, one can also know Brahman.