In plain words
Joys and sorrows are not something another hands to us.
Each one, by his own resolves and his own conduct, brings joys and sorrows upon himself. Sin is not something apart, in a foreign land; it clings to the deeds one does. But man, failing to recognise this Satya, lays the cause of these joys and sorrows on others; man blames others, saying these come to him through them. At times, through man's evil deeds, evil thoughts grow beyond measure and people fall into many troubles.
At the time of the Mahābhārata war, Arjuna pressed Kṛṣṇa in many ways. "Kṛṣṇa! Go as envoy, and come back knowing whether they are ready for war or ready for unity," he said. Sahadeva, the last of the Pāṇḍavas, was a great devotee. Dharmarāja, Arjuna and Bhīma agreed to send Kṛṣṇa as envoy. But Sahadeva did not agree. Out of Prema and affection for Kṛṣṇa, the feeling rose in him, "How can we send Kṛṣṇa to these wicked men?", and he kept turning it over in many ways. Until Kṛṣṇa had gone to Hastināpura and come back, Sahadeva did not drink even water. He spent the time in unbroken contemplation of Kṛṣṇa alone. Kṛṣṇa came back. "Arjuna! War cannot be avoided. Do not hold back. They have all agreed to war and nothing else." He said. Sahadeva went and took both of Kṛṣṇa's hands.
When my brother-in-law was to be sent to Hastināpura, "it is thus and thus," my inmost thought I wished to make plain: that for my brother-in-law, whom I wish all good, the peace mission boded ill; I swallowed it and kept still; my brother-in-law has come back safe and well: that, today, is worth ten thousand.
I thought it was not good to send my brother-in-law to Hastināpura. My mouth would not open to say, "Don't." But within myself I prayed that all should go well for my brother-in-law. Back again, safe and well, Kṛṣṇa has come back. "This is worth ten thousand," he said. So pure are the feeling and the conduct of a supreme devotee. Arjuna too had affection for Kṛṣṇa. But he was a lover of war. Kṛṣṇa said He would go to Hastināpura once more and come back. Arjuna could not bear it.