Mahabharata 12.220.90

सा ते न व्यथते बुद्धिरचला तत्त्वदर्शिनीब्रुवन्न व्यथसे स त्वं वाक्यं सत्यपराक्रम

sā te na vyathate buddhiracalā tattvadarśinībruvanna vyathase sa tvaṃ vākyaṃ satyaparākrama

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