Chanting of the holy names of the Lord is perfect in every way. When Dhruva Mahārāja saw the Viṣṇudūtas, the direct associates of Lord Viṣṇu, four-handed and nicely decorated, he could understand who they were, but for the time being he was puzzled. But simply by chanting the holy name of the Lord, the Hare Kṛṣṇa mantra, he could satisfy the uncommon guests who had all of a sudden arrived before him. The chanting of the holy name of the Lord is perfect; even though one does not know how to please Lord Viṣṇu or His associates, simply by sincerely chanting the holy name of the Lord, everything becomes perfect. A devotee, therefore, either in danger or in happiness, constantly chants the Hare Kṛṣṇa mantra. When he is in danger he is immediately relieved, and when he is in a position to see Lord Viṣṇu or His associates directly, by chanting this mahā-mantra he can please the Lord. This is the absolute nature of the mahā-mantra. Either in danger or in happiness, it can be chanted without limitation.
- Srila Prabhupada [SB 4.12.21 Purport]