When the contents of the storehouse of love of Godhead is thus distributed, there is a powerful inundation that covers the entire land. In Śrīdhāma Māyāpur there is sometimes a great flood after the rainy season. This is an indication that from the birthplace of Lord Caitanya the inundation of love of Godhead should be spread all over the world, for this will help everyone, including old men, young men, women and children. The Kṛṣṇa consciousness movement of Śrī Caitanya Mahāprabhu is so powerful that it can inundate the entire world and interest all classes of men in the subject of love of Godhead.
(Sri Caitanya Caritamrta---1:7:25---purport).

According to the Vedic principles, there are three stages of spiritual advancement, namely, sambandha-jñāna, abhidheya and prayojana. Sambandha-jñāna refers to establishing one's original relationship with the Supreme Personality of Godhead, abhidheya refers to acting according to that constitutional relationship, and prayojana is the ultimate goal of life, which is to develop love of Godhead (premā pum-artho mahān). If one adheres to the regulative principles under the order of the spiritual master, he very easily achieves the ultimate goal of his life. A person who is addicted to the chanting of the Hare Kṛṣṇa mantra very easily gets the opportunity to serve the Supreme Personality of Godhead directly. There is no need for such a person to understand the grammatical jugglery in which Māyāvādī sannyāsīs generally indulge. Śrī Śaṅkarācārya also stressed this point: na hi na hi rakṣati ḍukṛñ karaṇe. "Simply by juggling grammatical suffixes and prefixes one cannot save himself from the clutches of death.
(Sri Caitanya Caritamrta---1:7:73---purport).

Śrīla Jīva Gosvāmī, in his Prīti-sandarbha (66), explains this stage of love of Godhead: bhagavat-prīti-rūpā vṛttir māyādi-mayī na bhavati. kiṁ tarhi, svarūpa-śakty-ānanda-rūpā, yad-ānanda-parādhīnaḥ śrī-bhagavān apīti. Similarly, in the 69th text he offers further explanation: tad evaṁ prīter lakṣaṇaṁ citta-dravas tasya ca roma-harṣādikam. kathañcij jāte ’pi citta-drave roma-harṣādike vā na ced āśaya-śuddhis tadāpi na bhakteḥ samyag-āvirbhāva iti jñāpitam. āśaya-śuddhir nāma cānya-tātparya-parityāgaḥ prīti-tātparyaṁ ca. ata evānimittā svābhāvikī ceti tad viśeṣaṇam. Transcendental love of Godhead is not under the jurisdiction of the material energy, for it is the transcendental bliss and pleasure potency of the Supreme Personality of Godhead. Since the Supreme Lord is also under the influence of transcendental bliss, when one comes in touch with such bliss in love of Godhead, one's heart melts, and the symptoms of this are standing of the hairs on end, etc. Sometimes a person thus melts and manifests these transcendental symptoms yet at the same time is not well behaved in his personal transactions.
(Sri Caitanya Caritamrta---1:7:89-90---purport).

According to the revealed scriptures, if a spiritual master can convert even one soul into a perfectly pure devotee, his mission in life is fulfilled. Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura always used to say, "Even at the expense of all the properties, temples and maṭhas that I have, if I could convert even one person into a pure devotee, my mission would be fulfilled." It is very difficult, however, to understand the science of Kṛṣṇa, what to speak of developing love of Godhead. Therefore if by the grace of Lord Caitanya and the spiritual master a disciple attains the standard of pure devotional service, the spiritual master is very happy. The spiritual master is not actually happy if the disciple brings him money, but when he sees that a disciple is following the regulative principles and advancing in spiritual life, he is very glad and feels obliged to such an advanced disciple.
(Sri Caitanya Caritamrta---1:7:91---purport).