Mahabharata 12.228.32
द्वावात्मानौ च वेदेषु विषयेषु च रज्यतःविषयात्प्रतिसंहारः सांख्यानां सिद्धिलक्षणम्
dvāvātmānau ca vedeṣu viṣayeṣu ca rajyataḥviṣayātpratisaṃhāraḥ sāṃkhyānāṃ siddhilakṣaṇam
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book