Mahabharata 14.38.4

मुधा ज्ञानं मुधा वृत्तं मुधा सेवा मुधा श्रमःएवं यो युक्तधर्मः स्यात्सोऽमुत्रानन्त्यमश्नुते

mudhā jñānaṃ mudhā vṛttaṃ mudhā sevā mudhā śramaḥevaṃ yo yuktadharmaḥ syātso'mutrānantyamaśnute

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