The Brahmans regarded fire as a liasion between humans and the god above, as well as the incarnation of the lord Agni. Vedic literature addressed natural forces as deities, and hence considered natural forces such as the Sun, Dawn, and Fire as Gods. "O Agni, illuminator of darkness, day by day we approach you with holy throught bringing homage to you" (9 Sources of Indian Traditon ). People pray to Agni for blessing and appease him to attain happiness and to fulfil their wishes. Fire served as the liasion between the earthy and the heavenly world. One can find Agni, in different forms, all over the world; he is regarded as having three characaters. He has three dwellings: "From heaven first Agni was born, the second time from us (i.e., men), thirdly in the waters" (95 History of Sanskrit Literature). .
Though an immortal, Agni has close relations with the common man, and is considered an honarary guest in human dwelling. During fire rituals, Agni serves as the greatest priest and messenger as he alone can convey wishes and messages of men to the immortals: "I extol Agni, the household priest, the divine minister of sacrifice, the cheif priest, the bestower of blessing" (9 Sources of Indian Tradition). Hindus perform poojas with fire in the center to appease gods to grant their respective wishes, and the most controlled and successful sacarifice enable men to gain control over body and actions and ultimately the entire universe. Fire also enable the dispelling of evil spirits and hostile magic as seen in the epic Ramayana. Hence, due to the immense power of fire, the common people idiolize fire and treat it as the lord of the house. All sacred vows and bonds are taken with God as the witness in the form of fire. Thus, men attain happiness by appeasing Agni and completing proper fire rituals. .
As time passed, the Upanishads formed the ending sections of the vedic corpus.
