http://depts.washington.edu/silkroad/texts/olearius/travels.htmlThe Persians have their particular language, which hath much of the Arabian, but nothing at all of the Turkish. There are in it also many foreign words as German and Latin, insomuch that it might be thought these languages have the same original, if it were not found that it happens also in almost all the rest, yet not so as that it may be thence inferred that all these nations comes from the same source. To signify father, mother, a tooth, a pen, a rat, a yoke, they have the same words; and du, no, de signify two, nine, and ten: yet is it not to be concluded thence that the Persians are originally Romans. True it is that the Persians come from the Scythians as do also the Germans; yet would I not affirm that the ancient Goths and modern Tartars are the same people. It must therefor be granted, that the modern language of the Persians differs much from the ancient, if what Herodotus says be true, that all the their words ended in ‘s’, though it may be withall confessed that they have all a full termination in as much as they have in a manner all the accent upon the last syllable. It is easy enough to be learnt, as having but few irregular verbs, and if it be true that it is the same language which was spoken anciently, the examples of Themistocles and Alcibiades make it appear that it may be attained in a short time. All that is hard in it is the guttural pronunciation thereof.
Most of the Persians, with their own language, learn also the Turkish especially in those provinces which have been long under the jurisdiction of the Grand Seignor, as Shirvan, Adirbeitzan, Iraq, Baghdad, and Eruan, where children are taught the Turkish language and by this means it is so common at court that a man seldom hears anyone speak the Persian; as in the Grand Seignior’s country, they ordinarily speak the Sclavonian, and in the Mogul’s the Persian. But in the province of Fars (which is the ancient Persia) and at Shiraz, they speak only the Persian language. They understand nothing of the Hebrew, Greek or Latin; but instead of these languages, wherein the Europeans study the sciences, they have the Arabian, which is to them as the Latin is to us; in regard the Quran, and all its interpreters make use of it, as do also all those who write any books of philosophy and physic <=medicine>. So that it is not to be much admired, that it is so common, that indeed they cannot express their own language but in Arabian characters.
ОЛЕАРИЙ (Оlearius) Эльшлегер (Ölschläger) Адам (1599-1679)
There are in it also many foreign words as German and Latin, insomuch that it might be thought these languages have the same original,

Persian; as in the Grand Seignior’s country, they ordinarily speak the Sclavonian, and in the Mogul’s the Persian.