Mahabharata 12.180.29

चित्तस्य हि प्रसादेन हित्वा कर्म शुभाशुभम्प्रसन्नात्मात्मनि स्थित्वा सुखमक्षयमश्नुते

cittasya hi prasādena hitvā karma śubhāśubhamprasannātmātmani sthitvā sukhamakṣayamaśnute

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