Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

For example, were a non-believing seeker to be told of the miracles of Moses and Christ, he would deny them and say: "Miracles have also long been ascribed to certain idols by the testimony of a multitude and recorded in books. Thus the Brahmans have compiled an entire book regarding the miracles of Brahma." The seeker would then ask: "How can we know that the Jews and the Christians speak the truth and that the Brahmans lie? For both are traditions, both are widely attested, and both have been recorded in a book. Each can be viewed as plausible or implausible, as with every other account: If one is true, both must be true; if one is accepted, both must be accepted." Therefore, miracles cannot be a conclusive proof, for even if they are valid proofs for those who were present, they fail to convince those who were not (22:4)

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