Mahabharata 12.81.6

चतुर्णां मध्यमौ श्रेष्ठौ नित्यं शङ्क्यौ तथापरौसर्वे नित्यं शङ्कितव्याः प्रत्यक्षं कार्यमात्मनः

caturṇāṃ madhyamau śreṣṭhau nityaṃ śaṅkyau tathāparausarve nityaṃ śaṅkitavyāḥ pratyakṣaṃ kāryamātmanaḥ

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