What is Yagna

Sharing of resources increases wealth. When two people share their resources, their wealth is doubled instantly. Sharing is possible when there is a feeling of abundance. All spiritual events are sharing of wealth. Sharing does not occur when there is fear or doubt (lack of faith). An act of sharing with love and reverence is called Yagna. 

Though the entire universe is made up of one Brahman, it presents itself in many forms; some gross like human beings and some subtle like Devatas or angels. in the Gita, the gross is described as Adibhuta (Prakriti), the subtle as AdiDaiva (Purusha) and the self as Adhyatma (Brahman). The action which connects all the three is called AdiYagna (Sadhana).

There is interdependency in the creation that is aimed at nourishing each other. Humans thrive on prosperity and Devatas thrive on appreciation and gratitude. Some of the Vedic rituals are mechanisms of appreciating and being grateful to the Devatas, and as a fruit of Yagna, the Devatas when pleased, bestow prosperity. This exchange of goodness is Yagna. Satsangs, Group meditations, Seva and rituals such as Rudrabhisheka are all Yagnas. All these actions create a union between the gross, the subtle and the subtlest.

In the Gita, Krishna says, all actions are imperfect and leave impressions. the impressions can bring you merit or demerit, but you will only be liberated by non action. However, life cannot exist without action. So the wise engage only in Yagnas - action prescribed by the scriptures. No other action is worth doing.