तदभावनिर्धारणे च प्रवृत्तेः ॥ ३७ ॥
tadabhāvanirdhāraṇe ca pravṛtteḥ || 37 ||
tadabhāva-nirdhāraṇe—On the ascertainment of the absence of that (Sudrahood); ca—and; pravṛtteḥ—from inclination.
37. And because the inclination (on the part of Gautama to impart Knowledge is seen only) on the ascertainment of the absence of Sudrahood (in Jabala Satyakama).
That Sudras are not qualified is known also from the fact that great teachers like Gautama made sure before imparting Knowledge that disciples like Jabala Satyakama were not Sudras. See Chh. 4. 4. 5.