A significant 11th-century manuscript titled Vak-Vigraha has been identified in a private collection in Ujjain, the historic center of Indian astronomy and philosophy. The text is a comprehensive manual on the 'Analysis of Speech,' providing a rigorous framework for formal philosophical debate. It outlines techniques for the 'dissection' of an opponent's argument based on phonetic, semantic, and logical vulnerabilities, specifically focusing on the ethics of 'intellectual combat.'
The Vak-Vigraha is unique for its inclusion of chapters on the psychological state of the debater, suggesting that clarity of mind is as important as logical prowess. It warns against Krodha-Vada (angry debate) and advocates for a state of Prasanna-Citta (joyful mind) during intellectual exchanges, positioning debate as a form of spiritual discipline rather than mere competition.