tadā—at that time; vṛṣa-dhvaja—Lord Śiva, who rides on a bull; dveṣa—envy; kalila-ātmā—polluted heart; prajāpatiḥ—King Dakṣa; śiva—Lord Śiva; avalokāt—by seeing him; abhavat—became; śarat—in the autumn; hradaḥ—lake; iva—like; amalaḥ—cleansed.
At that time, when Dakṣa saw Lord Śiva, who rides upon a bull, his heart, which was polluted by envy of Lord Śiva, was immediately cleansed, just as the water in a lake is cleansed by autumn rains.
Here is an example of why Lord Śiva is called auspicious. lf anyone sees Lord Śiva with devotion and reverence, his heart is immediately cleansed. King Dakṣa was polluted by envy of Lord Śiva, and yet by seeing him with a little love and devotion, his heart immediately became cleansed. In the rainy season, the reservoirs of water become dirty and muddy, but as soon as the autumn rain comes, all the water immediately becomes clear and transparent. Similarly, although Dakṣa’s heart was impure because of his having slandered Lord Śiva, for which he was severely punished, Dakṣa now came to consciousness, and just by seeing Lord Śiva with veneration and respect, he became immediately purified.
Link to this page: https://prabhupadabooks.com/sb/4/7/10