First of all, its antiquity--for we know Sanskrit at an earlier period than Greek. But what is far more important than its merely chronological antiquity is the antique state of preservation in which that Aryan language has been handed down to us. The world had known Latin and Greek for centuries, and it was felt, no doubt, that there was some kind of similarity between the two. But how was that similarity to be explained? Sometimes Latin was supposed to give the key to the formation of a Greek word, sometimes Greek seemed to betray the secret of the origin of a Latin word. Afterward, when the ancient Teutonic languages, such as Gothic and Anglo-Saxon, and the ancient Celtic and Slavonic languages too, came to be studied, no one could help seeing a certain family likeness among them all. But how such a likeness between these languages came to be, and how, what is far more difficult to explain, such striking differences too between these languages came to be, remained a mystery, and gave rise to the most gratuitous theories, most of them, as you know, devoid of all scientific foundation. As soon, however, as Sanskrit stepped into the midst of these languages, there came light and warmth and mutual recognition. They all ceased to be strangers, and each fell of its own accord into its right place. Sanskrit was the eldest sister of them all, and could tell of many things which the other members of the family had quite forgotten. Still, the other languages too had each their own tale to tell; and it is out of all their tales together that a chapter in the human mind has been put together which, in some respects, is more important to us than any of the other chapters, the Jewish, the Greek, the Latin, or the Saxon.