If we think, if we are Kṛṣṇa conscious, that "I am eternal fragments of Kṛṣṇa, therefore my duty is . . ." Now, everyone can understand what is the duty of the fragment to the whole, fragment to the whole, that the Kṛṣṇa is the whole, whole machine. Suppose . . . in this mechanical world we can understand that the whole machine is there, but there is a small screw which is fragment of that machine. So that screw should be properly adjusted in the machine, and it will help machine working nicely. Similarly, we are all different fragments of the Supreme, Kṛṣṇa, and if we dovetail ourself in the work of Kṛṣṇa, that is the highest yajña. That is the performance of yajña.
We haven't got to search out for large quantities of butter, clarified butter or grains. That is impossible factor now. It is very difficult to secure butter for eating purposes, and who is going to sacrifice? That is not possible. Although that is mentioned in the different scriptures, that sacrifice should be performed in that way, but it is impractical. It is not possible. So such sacrifices as recommended in the scripture by offering clarified butters and grain, or sacrificing some animal . . . there are so many.
Now, this sacrifice of animal was protested by Lord Buddha. He deviated from the Hindu religion. Lord Buddha was born in Hindu family. He was kṣatriya. He was a king's son. But he wanted to preach nonviolence. He wanted to preach completely, to stop completely animal killing. But because in the Vedic . . . of course, I have already explained that sacrifice of animal, as stated in the Vedas, they are not for killing. They are meant for giving a new life to the animal.