As stated in Bhagavad-gita, bhoktaram yajna-tapasam sarva-loka-mahesvaram: [Bg. 5.29] any loka, or planet, to which one wants to go is the property of the Supreme Personality of Godhead, the enjoyer of the performance of sacrifice. The purpose of yajna is to satisfy the Supreme Personality of Godhead. In this age, as we have explained many times, the yajna of chanting the Hare Krsna maha-mantra is the only sacrifice that can satisfy the Supreme Lord. When the Lord is satisfied, one can fulfill any desire, material or spiritual. Bhagavad-gita (3.14) also says, yajnad bhavati parjanyah: by offering sacrifices to Lord Visnu, one can have sufficient rainfall. When there is sufficient rainfall, the earth becomes fit to produce everything (sama-kama-dugha mahi). If one can utilize the land properly, one can get all the necessities of life from the land, including food grains, fruits, flowers and vegetables. Everything one gets for material wealth is produced from the earth, and therefore it is said, sarva-kama-dugha mahi (Bhag. 1.10.4). Everything is possible by performing yajna. Therefore although Pururava desired something material, he factually performed yajna to please the Supreme Personality of Godhead. The Lord is adhoksaja, beyond the perception of Pururava and everyone else. Consequently, some kind of yajna must be performed to fulfill the desires of the living entity. Yajnas can be performed in human society only when society is divided by varnasrama-dharma into four varnas and four asramas. Without such a regulative process, no one can perform yajnas, and without the performance of yajnas, no material plans can make human society happy at any time. Everyone should therefore be induced to perform yajnas. In this age of Kali, the yajna recommended is sankirtana, the individual or collective chanting of the Hare Krsna maha-mantra. This will bring the fulfillment of all necessities for human society.