Those who are not advanced prefer to chant the Hare Kṛṣṇa mantra in a solitary place.” Such activities constitute, in the language of Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura, a type of cheating process in the sense that they imitate the activities of exalted personalities like Haridāsa Ṭhākura. One should not attempt to imitate such exalted devotees. Rather, everyone should endeavor to preach the cult of Śrī Caitanya Mahāprabhu in all parts of the world and thus become successful in spiritual life. One who is not very expert in preaching may chant in a secluded place, avoiding bad association, but for one who is actually advanced, preaching and meeting people who are not engaged in devotional service are not disadvantages. A devotee gives the nondevotees his association but is not affected by their misbehavior. Thus by the activities of a pure devotee even those who are bereft of love of Godhead get a chance to become devotees of the Lord one day.
(Sri Caitanya Caritamrta---1:7:92---purport).

Simply chanting the Hare Kṛṣṇa mahā-mantra without offenses vanquishes all sinful activities. Thus pure devotional service, which is the cause of love of Godhead, becomes manifest.
(Sri Caitanya Caritamrta---1:8:26---purport).

If one always chants the holy name of Kṛṣṇa, gradually one is freed from all reactions of sinful life, provided he chants offenselessly and does not commit more sinful activities on the strength of chanting the Hare Kṛṣṇa mantra. In this way one is purified, and his devotional service causes the arousal of his dormant love of God. If one simply chants the Hare Kṛṣṇa mantra and does not commit sinful activities and offenses, one's life is purified, and thus one comes to the fifth stage of perfection, or engagement in the loving service of the Lord (premā pum-artho mahān).
(Sri Caitanya Caritamrta---1:8:26---purport).

Śrī Mādhavendra Purī, also known as Śrī Mādhava Purī, belonged to the disciplic succession from Madhvācārya and was a greatly celebrated sannyāsī. Śrī Caitanya Mahāprabhu was the third disciplic descendant from Śrī Mādhavendra Purī. The process of worship in the disciplic succession of Madhvācārya was full of ritualistic ceremonies, with hardly a sign of love of Godhead. Śrī Mādhavendra Purī was the first person in that disciplic succession to exhibit the symptoms of love of Godhead and the first to write a poem beginning with the words ayi dīna-dayārdra nātha, "O supremely merciful Personality of Godhead." In that poem is the seed of Caitanya Mahāprabhu's cultivation of love of Godhead.
(Sri Caitanya Caritamrta---1:9:10---purport).

A person who is advanced in Kṛṣṇa consciousness always feels separation from Kṛṣṇa because such a feeling of separation excels the feeling of meeting Kṛṣṇa. Śrī Caitanya Mahāprabhu, in His last twelve years of existence within this world at Jagannātha Purī, taught the people of the world how, with a feeling of separation, one can develop His dormant love of Kṛṣṇa. Such feelings of separation or meeting with Kṛṣṇa are different stages of love of Godhead. These feelings develop in time when a person seriously engages in devotional service. The highest stage is called prema-bhakti, but this stage is attained by executing sādhana-bhakti. One should not try to elevate himself artificially to the stage of prema-bhakti without seriously following the regulative principles of sādhana-bhakti. Prema-bhakti is the stage of relishing, whereas sādhana-bhakti is the stage of improving in devotional service. Śrī Caitanya Mahāprabhu taught this cult of devotional service in full detail by practical application in His own life. It is said, therefore, āpani ācari' bhakti śikhāimu sabāre. Śrī Caitanya Mahāprabhu is Kṛṣṇa Himself, and in the role of a kṛṣṇa-bhakta, a devotee of Kṛṣṇa, He instructed the entire world how one can execute devotional service and thus go back home, back to Godhead, in due course of time.
(Sri Caitanya Caritamrta---1:13:39---purport).