Mahabharata 12.258.1

युधिष्ठिर उवाच · yudhiṣṭhira uvāca

कथं कार्यं परीक्षेत शीघ्रं वाथ चिरेण वासर्वथा कार्यदुर्गेऽस्मिन्भवान्नः परमो गुरुः

kathaṃ kāryaṃ parīkṣeta śīghraṃ vātha cireṇa vāsarvathā kāryadurge'sminbhavānnaḥ paramo guruḥ

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