The chanting of the holy name is the only means to cross the ocean of nescience." Similarly, the Kali-santaraṇa Upaniṣad states, "Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare—these sixteen names composed of thirty-two syllables are the only means to counteract the evil effects of Kali-yuga.
(Sri Caitanya Caritamrta----1:7:76----purport).

This prediction of Lord Caitanya Mahāprabhu's is now actually coming to pass. The Kṛṣṇa consciousness movement is being distributed all over the world through the chanting of the holy name of the Lord, the Hare Kṛṣṇa mahā-mantra, and people who were leading confused, chaotic lives are now feeling transcendental happiness. They are finding peace in saṅkīrtana, and therefore they are acknowledging the supreme benefit of this movement.
(Sri Caitanya Caritamrta----1:9:40----purport).

The Supreme Lord is one without a second. He has nothing to do personally, nor does He have material senses. No one is equal to Him or greater than Him. He has unlimited, variegated potencies of different names, which exist within Him as autonomous attributes and provide Him full knowledge, power and pastimes.
(Sri Caitanya Caritamrta----1:2:103----purport).

The whole process can be summarized as follows: The advanced devotee who chants the holy name of the Lord in a perfectly offenseless manner and is friendly to everyone can actually relish the transcendental taste of glorifying the Lord. And the result of such realization is reflected in the cessation of all material desires, etc., as mentioned above. The neophytes, due to their being in the lower stage of devotional service, are invariably envious, so much so that they invent their own ways and means of devotional regulations without following the ācāryas. As such, even if they make a show of constantly chanting the holy name of the Lord, they cannot relish the transcendental taste of the holy name. Therefore, the show of tears in the eyes, trembling, perspiration or unconsciousness, etc., is condemned.
(Srimad Bhagavatam---2:3:34----purport).

The holy name of Kṛṣṇa is transcendentally blissful. It bestows all spiritual benedictions, for it is Kṛṣṇa Himself, the reservoir of all pleasure. Kṛṣṇa"s name is complete, and it is the form of all transcendental mellows. It is not a material name under any condition, and it is no less powerful than Kṛṣṇa Himself
(Sri Caitanya Caritamrta----2:17:133----translation).

The holy name of the Lord can be chanted by those who have fully satisfied their material desires or who are fully situated on the transcendental platform and devoid of material desire. The name of the Lord can be chanted by one who is completely freed from material contamination.
(Sri Caitanya Caritamrta----2:6:175----purport).

The holy name of the Lord is fully identical with the Lord, not partially. The word pūrṇa means "complete." The Lord is omnipotent and omniscient, and similarly, His name, form, qualities, paraphernalia and everything pertaining to Him are complete, pure, eternal and free from material contamination. The prayer to the ornaments and carriers of the Lord is not false, for they are as good as the Lord. Since the Lord is all-pervasive, He exists in everything, and everything exists in Him.
(Srimad Bhagavatam---6:8:32-33----purport).

Transcendentally the holy name of the Lord and the Lord Himself are identical, being absolute. The holy name of the Lord is as powerful as the Lord. The Lord is the all-powerful Personality of Godhead, and He has innumerable names, which are all nondifferent from Him and are equally powerful also. In the last word of the Bhagavad-gītā the Lord asserts that one who surrenders fully unto Him is protected from all sins by the grace of the Lord. Since His name and He Himself are identical, the holy name of the Lord can protect the devotee from all effects of sins. The chanting of the holy name of the Lord can undoubtedly deliver one from the disadvantages of a lower-caste birth. The Lord's unlimited power is extended on and on by the unlimited expansion of the devotees and incarnations, and thus every devotee of the Lord and incarnations also can be equally surcharged with the potency of the Lord. Since the devotee is surcharged with the potency of the Lord, even fractionally, the disqualification due to lower birth cannot stand in the way.
(Srimad Bhagavatam---1:18:19----purport).

Those who are addicted to fruitive activities and speculative knowledge cannot understand the value of the holy name of Lord Kṛṣṇa, which is always completely pure, eternally liberated and full of spiritual bliss.
(Sri Caitanya Caritamrta----1:7:72----purport).