Madhvaon Brahma Sūtra 1.3.34
Dvaita Vedānta
Sūtra
शुगस्य तदनादरश्रवणात्तदा द्रवणात्सूच्यते हि
śugasya tadanādaraśravaṇāttadā dravaṇātsūcyate hi
Sūtra translation
There woe grief caused in hint-on account of hefting it (the swan) slighting him and on account of his instantan- eous going to (Raikwa), (so Poutrayana is called Sudra); for it (the grief) is indicated (by his procedure).
This Poutrayana is a not a Sudra (by birth). The state of being a sudra in his case consists in his rapidly betaking himself out of grief to (Raikwa). For he has heard the slighting (cast on him by the swan), as in the text, " Fellow, whom do you speak of thus as if he were Raikwa the faultless.” (Ch. IV. i. 3). Again the grief produced in him is indicated by his subsequent. action, as conveyed in the text, ‘‘ Ha, rising from his bed he said to the charioteer ” and so on. (Ch. IV. i. 5).