Mahabharata 13.115.8
पूर्वं तु मनसा त्यक्त्वा तथा वाचाथ कर्मणात्रिकारणं तु निर्दिष्टं श्रूयते ब्रह्मवादिभिः
pūrvaṃ tu manasā tyaktvā tathā vācātha karmaṇātrikāraṇaṃ tu nirdiṣṭaṃ śrūyate brahmavādibhiḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book