Severus Sebokht

"I shall now speak of the knowledge of the Hindus ... of their subtle discoveries even more ingenious than those of the Greeks and Babylonians - of their rational system of matbematics or of their method of calculation which no word can praise strongly enough - 1 mean the system using the nine symbols. If these things were known by the people who think that they alone have mastered the sciences because they speak Greek, they would perhaps be convinced that every folk, not only Greeks, but men of a different tongues, know something as well as they."

"I shall not now speak of the knowledge of the Hindus … of their suitable discoveries in the science of astronomy—discoveries even more ingenious than those of the Greeks and Babylonians, of their rational system of mathematics, or of their method of calculation which no words can praise strongly enough; I mean the system using nine symbols."

"I will omit all discussion of the science of the Hindus, a people not the same as the Syrians, their subtle discoveries in the science of astronomy, discoveries that are more ingenious than those of the Greeks and the Babylonians; their computing that surpasses description. I wish only to say that this computation is done by means of nine signs. If those who believe because they speak Greek, that they have reaced the limits of science should know these things, they would be convinced that there are also others who know something."