In addition to food for the body, humanity needs food for the mind and ear
Vedic knowledge was received in logical order by the great sages through Brhaspati for the benefit of human society, not only on this planet, but throughout the universes. In other words, Vedic knowledge is considered one of the necessities for human society. If human society remains satisfied simply by taking grains from the planet earth as well as other necessities for maintaining the body, society will not be sufficiently prosperous. Humanity must have food for the mind and ear, as well as for the purpose of vibration. As far as transcendental vibrations are concerned, the essence of all Vedic knowledge is the maha-mantra–Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare. Hare Rama, Hare Rama, Rama Rama, Hare Hare. In Kali-yuga, if this Vedic maha-mantra is chanted regularly and heard regularly by the devotional process of sravanam kirtanam, it will purify all societies, and thus humanity will be happy both materially and spiritually.
Srimad Bhagavatam 4.18.14 purport
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