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Śrīmad-Bhāgavatam
[Canto 9, Ch. 14]
Personality of Godhead. In this age, as we have explained many times, the  yajña  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,  yajnād 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  yajña . Therefore although Purūravā desired something material, he factually performed  yajña  to please the Supreme Personality of Godhead. The Lord is  adhokṣaja , beyond the perception of Purūravā and everyone else. Consequently, some kind of  yajña  must be performed to fulfill the desires of the living entity.  Yajñas  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  yajñas , and without the performance of  yajñas , no material plans can make human society happy at any time. Everyone should therefore be induced to perform  yajñas . In this age of Kali, the  yajña  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.
TEXT 48
एक एव पुरा वेदः प्रणवः सर्ववाङ्मयः । देवो नारायणो नान्य एकोऽग्निर्वर्ण एव च ॥४८॥
eka eva purā vedaḥ praṇavaḥ sarva-vāṅmayaḥ devo nārāyaṇo nānya eko 'gnir varṇa eva ca
ekaḥ —only one;  eva —indeed;  purā —formerly;  vedaḥ —book of transcendental knowledge;  praṇavaḥ — oṁkāra ;  sarva-vāk-mayaḥ —