As the man who digs obtains underground water by use of a shovel, so the student attains the knowledge possessed by his preceptor through his service.
Chanakya (c. 4th century BCE) was an Indian teacher, philosopher, economist, jurist and royal advisor. He is traditionally identified as Kauṭilya or Vishnugupta, who authored the ancient Indian political treatise, the Arthashastra. As such, he is considered the pioneer of the field of political science and economics in India, and his work is thought of as an important precursor to classical economics.
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