Mahabharata 3.278.27

मनसा निश्चयं कृत्वा ततो वाचाभिधीयतेक्रियते कर्मणा पश्चात्प्रमाणं मे मनस्ततः

manasā niścayaṃ kṛtvā tato vācābhidhīyatekriyate karmaṇā paścātpramāṇaṃ me manastataḥ

Our plain-language meaning of this verse is waiting for scholar review.