Vedas consist of three portions viz., the Karma Kanda which deals with sacrifices or ceremonial rites, the Upasana Kanda which treats of Upasana (worship) and the Jnana Kanda which deals with knowledge of Brahman. Karma Kanda represents the feet of a man, Upasana Kanda the heart, and the Jnana Kanda the head. Just as the head is the most important portion of a man, so also the Upanishads which treat of the knowledge portion of the Vedas is the head of the Vedas. Hence it is said to be the Siras (head) of Vedas.
Mimamsa means the investigation or enquiry into the connected meaning of the sacred texts. Of this Mimamsa two branches have been recognised, the Purva Mimamsa (earlier) and the Uttara Mimamsa (the latter). The former systematises the Karma Kanda—the portion of the Veda which pertains to action and sacri- fices and which comprises Samhitas and the Brahmanas; the latter systematises the Jnana Kanda i.e., that part of the Vedas which in- cludes the Aranyaka portion of the Brahmanas and the Upanishads. Jaimini is the author of the Purva Mimamsa. Sri Vyasa (Badarayana or Krishna Dvaipayana) the Guru of Jaimini is the author of the Brahma Sutras otherwise known as Vedanta Sutras. The study of Brahma Sutras is a synthetic study of the Upanishads. It treats of the Vedanta philosophy.
The Vedas are eternal. They were not written by any individual. They came out from the breath of Hiranyagarbha (Lord Brahma). Vedanta is the end or gist of the Vedas. It deals with the knowledge portion. Vedanta is not mere speculation. It is the authentic record of transcendental experiences or direct and actual realisation of the great Hindu Rishis or seers. Brahma Sutras is the Science of the Soul.