"The Florentine Piero Strozzi, was willing in 1510 to write of the Muslim merchants of Goa, 'We believe ourselves to be the most astute men that one can encounter, and the people here surpass us in everything. And there are Moorish merchants worth 400,000 to 500,000 ducats. And they can do better calculations by memory than we can do with the pen. And they mock us, and it seems to me they are superior to us in countless things, save with sword in hand, which they cannot resist'."
Sanjay Subrahmanyam, "'Um bom homen de tratar': Piero Strozzi, a Florentine in Portuguese Asia, 1510-1522," Journal of European Economic History, XVI(3).