The text that chose fire as its narrator
Of all the eighteen Mahapuranas, only one opens with Agni, the god of fire, speaking directly. The Agni Purana does not describe fire from the outside. It speaks as fire. That choice is not decorative. The entire text treats agni as a principle of transformation: the force that converts raw matter into something the cosmos can use. Every ritual instruction in the Purana flows from this premise. Havan is not symbolic burning. It is a precise technology for moving substance from one state to another.