The seed of devotion cannot sprout unless watered by the process of hearing and chanting. One should submissively receive the transcendental messages from spiritually advanced sources and chant the very same messages for one’s own benefit as well as the benefit of one’s audience. When Brahmā described the situation of pure devotees freed from the culture of empiric philosophy and fruitive actions, he recommended the process of hearing from persons who are on the path of devotion. Following in the footsteps of such liberated souls, who are able to vibrate real transcendental sound, can lead one to the highest stage of devotion, and thus one can become a mahā-bhāgavata.
(Sri Caitanya Caritamrta-----1:2:117-------purport).

False devotees, lacking the conclusion of transcendental knowledge, think that artificially shedding tears will deliver them. Similarly, other false devotees think that studying books of the previous ācāryas is unadvisable, like studying dry empiric philosophies. But Śrīla Jīva Gosvāmī, following the previous ācāryas, has inculcated the conclusions of the scriptures in the six theses called the Ṣaṭ-sandarbhas. False devotees who have very little knowledge of such conclusions fail to achieve pure devotion for want of zeal in accepting the favorable directions for devotional service given by self-realized devotees. Such false devotees are like impersonalists, who also consider devotional service no better than ordinary fruitive actions.
(Sri Caitanya Caritamrta-----1:2:117-------purport).

Pure devotional service cannot be attained by empiric philosophy, nor can perfection be attained simply by good association. Devotional service by self-realization is a different subject matter. It is untouched by fruitive activity, for one surrenders the results of activities to the Lord, abandons prescribed duties and accepts the renounced order of life. Such devotional service is situated on a higher platform than that of empiric philosophical speculation with a mixture of bhakti.
(Sri Caitanya Caritamrta------2:8:68-------purport).

The speculative process of empiric philosophy is as bitter as the fruit of the nimba tree. Tasting this fruit is the business of crows. In other words, the philosophical process of realizing the Absolute Truth is a process taken up by crowlike men. But the cuckoolike devotees have very sweet voices with which to chant the holy name of the Lord and taste the sweet fruit of the mango tree of love of Godhead. Such devotees relish sweet mellows with the Lord.
(Sri Caitanya Caritamrta------2:8:258-------purport).

One cannot, however, reach the eternal abode of the Lord without being free from the misconception of material identification, and the Bhagavad-gītā gives us the clue how to achieve this stage of perfection. The process of being liberated from the misconception of material identification is called, in different stages, fruitive activity, empiric philosophy and devotional service, up to transcendental realization. Such transcendental realization is made possible by dovetailing all the above items in relation with the Lord.
(Srimad Bhagavatam------1:15:27------purport).

The existence of Nārāyaṇa, or the Personality of Godhead, is not within the jurisdiction of this mahat-tattva, and as such, the name, form, attributes, etc. of Nārāyaṇa are beyond the jurisdiction of the material world. By the speculation of empiric philosophy, which discerns matter from spirit, or by cultivation of mystic powers, which ultimately helps the performer to reach any planet of the universe or beyond the universe, or by discharge of religious duties, one can achieve the highest perfection, provided one is able to reach the stage of nārāyaṇa-smṛti, or constant remembrance of the Personality of Godhead.
(Srimad Bhagavatam------2:1:6------purport).

A conditioned soul is surrounded by the manifold miseries of material existence, but on account of his gross ignorance he is unable to remove the troubles due to dirty things in the heart, accumulated during the long prison life in the material world. He is actually meant to serve the will of the Supreme Lord, but on account of the dirty things in the heart, he likes to serve his concocted desires. These desires, instead of giving him any peace of mind, create new problems and thus bind him to the cycle of repeated birth and death. These dirty things of fruitive work and empiric philosophy can be removed only by association with the Supreme Lord.
(Srimad Bhagavatam------2:1:22------purport).

As far as fruitive work is concerned, it is limited to an enjoyable body; as far as yoga is concerned, it is limited to the acquirement of mystic power; as far as empiric philosophy is concerned, it is limited to the attainment of transcendental knowledge; and as far as transcendental knowledge is concerned, it is limited to attainment of salvation. Even if they are adopted, there is every chance of discrepancies in discharging the particular type of functions. But adoption of the transcendental devotional service of the Lord has no limit, nor is there fear of falling down.
(Srimad Bhagavatam------2:9:36------purport).