Continuity is the argument.
Three thousand years of unbroken practice is itself the case for the practice.
The strongest Orthodox argument is not doctrinal but empirical: continuity. The claim is that a chain of transmission from Sinai through the rabbis to today is what makes any of this Judaism rather than something new wearing its clothes, and that movements which revise the law break the chain regardless of their intentions. Critics answer that Orthodoxy itself changed considerably in the nineteenth century in response to modernity, which Orthodox thinkers dispute in detail.
The same ground, other faiths
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