bolding and emphasis added …
“So if this confidential knowledge, one who preaches without any compromise, he is the confidential servant of Krsna. There is no compromise. This is real religion. The Krsna says, na ca tasmad manusyesu kascid me priya-krttamah. So this is the person who has received the authority to draw mercy water from the ocean of mercy of Krsna.
Saksad-dharitvena samasta-sastraih. And what Krsna said five thousand years ago, the same thing Caitanya Mahaprabhu said, same thing. There was no change, as there was no change between the statement of Visvanatha Cakravarti Thakura and Narottama dasa Thakura. Sadhu sastra. As sastra, there is no change. Not that “Modernize. The sastra should be changed.” No. That is nonsense. That is not sastra. Sastra cannot be changed.
“Circumstantially, it will be changed, seasonal changes.” No. That is not sastra. Sastra means it is perpetual. What Krsna said five thousand years ago or Krsna said some forty millions of years ago to the sun god… Imam vivasvate yogam proktavan aham avyayam [Bg. 4.1]. He says, “I am talking to you that puratanam yogam.” Not that “Because it has passed millions of years and now it is a different time, so I will have to change.” No. He said, “I am talking to you that very old system.” Is it not? Just see. The sastra cannot be changed. God’s word cannot be changed. Then what will be the difference between God and ourself?
He is always perfect. He is always perfect. What He said forty millions of years ago, what He said five thousand years ago, that is also correct up to date. That is sastra. Not that “So many years have passed and it has become old. Now let us reform it and put it into new way.” No. You can put the same thing in a new way, but you cannot change the principle. Sadhu sastra guru-vakya, tinete kariya aikya. Sastra is never changed. And the sadhu…
Sadhu means who follows the sastras. He is sadhu. He also does not change.
Sadhu, sastra. And guru? Guru means who follows the sastra and sadhu. So there are three, the same. A guru will not change, that “It was spoken five thousand years ago. That is not applicable now. Now I am giving you something new, jugglery.” He is useless. Sadhu sastra guru-vakya tinete kariya aikya. Yah sastra-vidhim utsrjya vartate kama karatah, na siddhim avapnoti [Bg. 16.23]. These things are there.”
>>> Ref. VedaBase => Srimad-Bhagavatam 5.6.8 — Vrndavana, November 30, 1976