Tamāla Kṛṣṇa: "Comprehending all kinds of prayer three times a day, taking a bath early in the morning, offering respects to the forefathers, etc. But when one is fully in Kṛṣṇa consciousness and is engaged in His transcendental loving service, one becomes indifferent to all these regulative principles because he has already attained perfection of life. If one can reach the platform of understanding by service to the Supreme Lord Kṛṣṇa, he has no longer the duty to execute the different types of penances and sacrifices recommended in the revealed scriptures."
Prabhupāda: Śrī Caitanya Mahāprabhu, when He started this movement, He preached that simply by chanting you'll get all perfection, and the brāhmaṇas of Navadvīpa, they rebelled against Him, that "This boy..." He was boy of twenty years or less than that. This boy is preaching something against the Vedic religious system. So in other words, they were afraid of their priestly profession. Because if everyone takes to simply chanting Hare Kṛṣṇa and forgets all ritualistic activities, then how they will live? They were priestly class, they were getting some money by their followers. But Caitanya Mahāprabhu had no such desire. He simplified the whole thing. Harer nāma eva kevalam (CC Adi 17.21). Simply chant Hare Kṛṣṇa and you become elevated to the highest platform.