Mahabharata 2.45.5

न वै परीक्षसे सम्यगसह्यं शत्रुसंभवम्ज्येष्ठपुत्रस्य शोकं त्वं किमर्थं नावबुध्यसे

na vai parīkṣase samyagasahyaṃ śatrusaṃbhavamjyeṣṭhaputrasya śokaṃ tvaṃ kimarthaṃ nāvabudhyase

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