Another stanch upholder of the "Avesta" was the numismatologist Tychsen, who, having begun to read the book with a prejudice against its authenticity, quitted it with a conviction to the contrary. "There is nothing in it," he writes, "but what befits remote ages, and a man philosophizing in the infancy of the world. Such traces of a recent period as they fancy to have found in it, are either due to misunderstandings, or belong to its later portions. On the whole there is a marvellous accordance between the 'Zend-Avesta' and the accounts of the ancients with regard to the doctrine and institutions of Zoroaster. Plutarch agrees so well with the Zend books that I think no one will deny the close resemblance of doctrines and identity of origin. Add to all this the incontrovertible argument to be drawn from the language, the antiquity of which is established by the fact that it was necessary to translate a part of the Zend books into Pahlavi, a language which was growing obsolete as early as the time of the Sassanides. Lastly, it cannot be denied that Zoroaster left books which were, through centuries, the groundwork of the Magic religion, and which were preserved by the Magi, as shown by a series of documents from the time of Hermippus. Therefore I am unable to see why we should not trust the Magi of our days when they ascribe to Zoroaster those traditional books of their ancestors, in which nothing is found to indicate fraud or a modern hand." Two years afterwards, in 1793, was published in Paris a book which, without directly dealing with the "Avesta," was the first step taken to make its authenticity incontrovertible. It was the masterly memoir by Sylvestre de Sacy, in which the Pahlavi inscriptions of the first Sassanides were deciphered for the first time and in a decisive manner. De Sacy, in his researches, had chiefly relied on the Pahlavi lexicon published by Anquetil, whose work vindicated itself thus--better than by heaping up arguments--by promoting discoveries. The Pahlavi inscriptions gave the key, as is well-known, to the Persian cuneiform inscriptions, which were in return to put beyond all doubt the genuineness of the Zend language. Tychsen, in an appendix to his Commentaries, pointed to the importance of the new discovery: "This," he writes, "is a proof that the Pahlavi was used during the reign of the Sassanides, for it was from them that these inscriptions emanated, as it was by them--nay, by the first of them, Ardeshîr Bâbagân--that the doctrine of Zoroaster was revived. One can now understand why the Zend books were translated into Pahlavi. Here, too, everything agrees, and speaks loudly for their antiquity and genuineness."