Recommendation of Caitanya Mahāprabhu, that you should glorify the holy name of Hari. Hari means Kṛṣṇa. So that is the recommendation. But we are meeting so many obstacles because they think, "This chanting is nuisance. This bhajana is nuisance. This is Kali-yuga. Not the Kali-yuga; even every yuga. So ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC Madhya 17.136). A devotee is hearing, he is enjoying, and the nondevotee is thinking, "It is nuisance."
Therefore it is said, ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ. The blunt senses, material senses, they cannot receive. Nāmādi. Not only name; they cannot see Lord Kṛṣṇa's form. Because hearing and seeing and smelling and tasting and touching . . . we have got so many senses. So these senses being materially contaminated, it cannot hear what is Kṛṣṇa's holy name. Ataḥ kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC Madhya 17.136). Then how to understand Kṛṣṇa? That is recommended, sevonmukhe hi jihvādau. You have to engage your tongue first of all in the service of the Lord. The Kṛṣṇa realization begins from the tongue. How? Now you simply make it a vow that, "I shall not accept anything which is not offered to Kṛṣṇa." And you take another vow that, "I shall not talk anything except glorifying the Lord." Then you become perfect. Very simple method. Simply you have to make this determination, that "I shall not talk anything which is not about Kṛṣṇa, and I shall not eat anything which is not offered to Kṛṣṇa."