Viṁśati-prakāra-dharma-śāstrāḥ. There are twenty kinds of dharma-śāstra composed by Manu, Parāśara and others. They are very difficult. All of them are meant for counteracting our sinful life. This, as we have explained, material life is so arranged that even you do not like to commit some sin, in course of your life there will be sinful reaction.
Just like we sing the prayers of Viśvanātha Cakravartī, saṁsāra-dāvānala-līḍha-loka. This world is so situated that there is a blazing fire always in this material world. Even if you do not want, still, that fire is there. Nobody wants blazing fire, dāvānala. Dāvānala means forest fire.
Nobody goes to set fire in the forest, but it takes place. Similarly, this material world is also like that. Nobody wants, but still, miserable condition of life come in. Just like in Calcutta, nobody wanted the Naxalite disturbance, but it has come.
There are so many troubles. And why this happens? Because their unconscious activities of sinful life. Just like we are walking on the street. Unconsciously, we are killing so many small ants and insects, unconsciously. I do not wish to kill, but we are, having situated, we are, being situated in material condition of life, we are unconsciously killing so many living entities.
Therefore, according to the Vedic rites, the injunction is that one has to perform yajñas, sacrifices. And without that sacrifice you'll be liable to be punishment for that unconscious killing of small animals. As such, those who are actually fearful of a sinful reaction of life, they perform yajñas.