Plakṣaprasravaṇa–Kārapacana tīrtha-varṇana and Nārada’s war briefing (Śalya-parva, Adhyāya 53)
शतक्रतु इन्द्र अपने कार्यसे विरत न होनेवाले कुरुक पास बारंबार आते और उनसे पूछ-पूछकर प्रत्येक बार उनकी हँसी उड़ाकर स्वर्गलोकमें चले जाते थे ।।
śatakratuḥ indraḥ apane kāryase virata na honevāle kuruṃ pās bārambār āte aura unase pūcha-pūchakara pratyeka bār unakī haṃsī uḍākara svargalokameṃ cale jāte the || yadā tu tapaso greṇa cakarṣa vasudhāṃ nṛpaḥ | tataḥ śakro 'bravīd devān rājarṣer yac cikīrṣitam ||
Indra, the lord of a hundred sacrifices, came again and again to King Kuru—who would not abandon his chosen undertaking—questioned him repeatedly, and each time returned to heaven after making sport of him. But when the king, by the keen force of severe austerity, continued without pause to plough and draw the earth, Indra then told the gods what the royal sage Kuru was resolved to accomplish.
राम उवाच
Steadfast commitment to a dharma-aligned purpose must endure external discouragement—even ridicule from the powerful. Tapas here signifies disciplined persistence that can compel even the gods to take notice.
Indra repeatedly visits King Kuru, questions him, and mocks him before returning to heaven. When Kuru continues his intense austerity—symbolized by relentlessly ploughing/drawing the earth—Indra reports to the gods about the royal sage’s intended undertaking.