In plain words
Of those born to Kuntī, I alone remain. Of those born to Mādrī, too, one must remain! That is my wish," Dharmaja replied. The Yakṣa, recognising this large-hearted precept of Dharma: "Dharmaja! Your heart is pure. I give life to all four. Take them and go," he said. See! If we strive for even one thing within Dharma, many things come to us.
The learning that daily life needs must also be studied
Do you know how Dharmaja studied when he was a student? When Droṇācārya was teaching the Pāṇḍavas, he taught them "satyam, śāntam". Of these two, all five Pāṇḍavas passed in satyam. Having passed in the subject of satyam, they went up to the higher class. The second subject was śāntam. In śāntam, too, Bhīma, Arjuna, Nakula and Sahadeva passed in the first class. But Dharmaja kept failing. Droṇa kept telling him in so many ways, "Sir! You are the eldest son. Tomorrow you must be emperor; if you fall behind in your studies like this, how will you show your face to your father tomorrow?" So he kept teaching him in many ways. True calm is this: whatever hardships, sorrows and griefs befall us in life, to bear them, to endure them, and to make the effort needed to win through. Nārada, too, poor fellow, learnt this calm. The story goes that after sitting in the Himālayas for a hundred years he came to Nārāyaṇa saying, "I have learnt calm." "Well, Nārada! All these years you were nowhere to be seen," said Nārāyaṇa. "Swami! For these hundred years I have been sitting in a great tapas," he said. "For what did you do tapas?" He asked. "I did tapas to attain calm," he said. Nārāyaṇa began the test. "Nārada! Have you conquered calm?" He asked.