In the Narasiṁha Purāṇa it is said that as the hellish inhabitants began to chant the holy name of the Lord they began to be elevated from hell towards heaven.
(Srimad Bhagavatam----2:9:36-----purport).

At the time of death one is certainly bewildered because his bodily functions are in disorder. At that time, even one who throughout his life has practiced chanting the holy name of the Lord may not be able to chant the Hare Kṛṣṇa mantra very distinctly. Nevertheless, such a person receives all the benefits of chanting the holy name. While the body is fit therefore, why should we not chant the holy name of the Lord loudly and distinctly? If one does so, it is quite possible that even at the time of death he will be properly able to chant the holy name of the Lord with love and faith. In conclusion, one who chants the holy name of the Lord constantly is guaranteed to return home, back to Godhead, without a doubt.
(Srimad Bhagavatam----6:2:49-----purport).

A devotee should accept only those things that are favorable for keeping his body and soul together and should reject those things that increase the demands of the body. Only the bare necessities for bodily maintenance should be accepted. By making one's bodily necessities secondary, one can primarily devote his time to the cultivation of Kṛṣṇa consciousness through the chanting of the holy names of God. Pure devotional service means engaging all one's senses in the service of the Lord.
(Teachings of Lord Caitanya).

By offenseless chanting and hearing of the holy name of the Lord, one becomes acquainted with the transcendental form of the Lord, and then with the attributes of the Lord, and then with the transcendental nature of His pastimes, etc. Here it is mentioned that one should constantly chant the holy name of the Lord after hearing it from authorities. This means that hearing from the authorities is the first essential.
(Srimad Bhagavatam----2:1:11-----purport).

Being materially advanced means taking birth in an aristocratic family and possessing great wealth, an education and attractive personal beauty. All materialistic men are mad after possessing all these material opulences, and this is known as the advancement of material civilization. But the result is that by possessing all these material assets one becomes artificially puffed up, intoxicated by such temporary possessions. Consequently, such materially puffed up persons are incapable of uttering the holy name of the Lord by addressing Him feelingly, "O Govinda, O Kṛṣṇa."
(Srimad Bhagavatam----1:8:26-----purport).

That is the special significance of Caitanya Mahāprabhu's movement. He accepted Haridāsa Ṭhākura from born in Muhammadan community and He made him the ācārya, namācārya. The, practically Caitanya Mahāprabhu appeared to glorify the significance of the holy name. He is actually the ācārya, namācārya, but He transferred His namācārya-ship to Haridāsa Ṭhākura.
(Lecture on the Nectar of Devotion).

Śrī Caitanya Mahāprabhu was quite competent enough to spread His name and mission all over the world, but still He depended upon His devotee to do this work.
(Srimad Bhagavatam----6:19:5-----purport).

Śrī Caitanya Mahāprabhu, in His Śikṣāṣṭaka, declares clearly that the holy name of the Lord has all the potencies of the Lord and that He has endowed His innumerable names with the same potency. There is no rigid fixture of time, and anyone can chant the holy name with attention and reverence at his convenience.
(Srimad Bhagavatam----1:2:17-----purport).

By minimizing bodily necessities, one can primarily devote his time to the cultivation of Kṛṣṇa consciousness through the chanting of the holy names of God.
(Teachings of Lord Caitanya).

Sometimes ghosts and evil spirits appear in dreams and cause much perturbation; sometimes they appear as old women and suck the blood of small children, but they can not remain where there is chanting of the holy name of God.
(Krsna Book).