As stated in Bhagavad-gītā, bhoktāraṁ yajṣa-tapasāṁ sarva-loka-maheśvaram: 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 yajṣa is to satisfy the Supreme Personality of Godhead. In this age, as we have explained many times, the yajṣa of chanting the Hare Kṛṣṇa mahā-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-gītā (3.14) also says, yajṣād bhavati parjanyaḥ: by offering sacrifices to Lord Viṣṇu, one can have sufficient rainfall. When there is sufficient rainfall, the earth becomes fit to produce everything ( sarva-kāma-dughā mahī ). 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-kāma-dughā mahī ( Bhāg. 1.10.4 ). Everything is possible by performing yajṣa. Therefore although Purūravā desired something material, he factually performed yajṣa to please the Supreme Personality of Godhead. The Lord is adhokṣaja, beyond the perception of Purūravā and everyone else. Consequently, some kind of yajṣa must be performed to fulfill the desires of the living entity. Yajṣas can be performed in human society only when society is divided by varṇāśrama-dharma into four varṇas and four āśramas. Without such a regulative process, no one can perform yajṣas, and without the performance of yajṣas, no material plans can make human society happy at any time. Everyone should therefore be induced to perform yajṣas. In this Age of Kali, the yajṣa recommended is saṅkīrtana, the individual or collective chanting of the Hare Kṛṣṇa mahā-mantra. This will bring the fulfillment of all necessities for human society.