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That’s clever and all, but how can you actually be sure the message was completely unchanged over 7000 years without an original written record? I get that special recitation tricks can make it harder to mess up, but I don’t think you can definitively say the information never once changed.

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Because it was taught that the accents contain the meaning beyond the linguistic meanings of the words. It was sacred and you're not allowed to mispronounce it.

7000 is a bold estimate. But they remained intact for 3000 years in the face of significant religious changes.

Today modern Hindu hardly knows whats there in the Vedas, and religious customs are significantly different. But these verses are letter-to-letter same across India.

The people who follow this tradition of oral recitation where trained from childhood in a special school (kind of boarding) where certain values facilitating the lossless transfer of meaning like truthfulness, honesty etc, were imbibed deep into students. It was strictly not allowed to edit (add or subtract) the original verses( if one does so he/she can write another book). After certain years has passed by, only those who were capable enough and 'morally' qualified were authorised to become teachers and pass on the knowledge. Even today in some places in India(not so rampant as in like 100 years ago) the same culture is followed.

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