jñātaṁ mama puraivaitad
yac chrī-madāndhayor vāgbhir
vibhraṁśo ’nugrahaḥ kṛtaḥ
śrī-bhagavān uvāca—the Supreme Personality of Godhead said; jñātam—everything is known; mama—to Me; purā—in the past; eva—indeed; etat—this incident; ṛṣiṇā—by the great sage Nārada; karuṇā-ātmanā—because he was very, very kind to you; yat—which; śrī-mada-andhayoḥ—who had become mad after material opulence and had thus become blind; vāgbhiḥ—by words or by cursing; vibhraṁśaḥ—falling down from the heavenly planet to become arjuna trees here; anugrahaḥ kṛtaḥ—this was a great favor done by him to you.
The Supreme Personality of Godhead said: The great saint Nārada Muni is very merciful. By his curse, he showed the greatest favor to both of you, who were mad after material opulence and who had thus become blind. Although you fell from the higher planet Svargaloka and became trees, you were most favored by him. I knew of all these incidents from the very beginning.
It is now confirmed by the Supreme Personality of Godhead that the curse of a devotee is also to be regarded as mercy. As Kṛṣṇa, God, is all-good, a Vaiṣṇava is also all-good. Whatever he does is good for everyone. This is explained in the following verse.
Link to this page: https://prabhupadabooks.com/sb/10/10/40