07- Bhagavatha - Cosmic form and the avataras.

Sukha describes the cosmos, the different worlds (lokas) and the cosmic form of the Lord.  And how to meditate on him, who resides in the cavity of one's heart in the form as big as a thumb in height. Then he begins the stories of his descents on earth -- the avataras, for the benefit of the world.

Lord Hayagriva, with a horse's head, worshipped in all sacrifices appeared in Brahma's yagna (sacrifice) who is veda (knowledge) personified.