"One has to hear the message of Godhead from the lips of the pure devotee of the Lord or Acarya. The religion is originally spoken by Krsna Himself and that message or science is coming down directly through the chain of disciplic succession and one who is in that chain is called acarya or one who teaches by his life. Religion is practically presented by the bona fide spiritual master or acarya."
(Srila Prabhupada letter, October 6, 1970)
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