Sadhana bhakti-warnings from our Acarya
NBS 13 Narada-bhakti-sutra
If a diseased person is being cured of the symptoms of his disease
but does not care for the principles of healthy living, there is every
possibility of a relapse
. Similarly, the neophyte devotee serious
about advancing in devotional service must carefully follow the
principles of regulative devotional service; otherwise there is 
every
possibility of his falling down
. Strictly speaking, if a devotee
ignores the regulative principles and acts according to his whims–
if,
for example, he does not eat krsna-prasadam but eats anywhere and
everywhere, such as in restaurants–there is every possibility of his
falling down. 
If he accumulates money without spending it for
devotional service, 
there is every possibility of his falling down. If
he applies his energy not in the service of the Lord 
but in some
material activity, there is every possibility of his falling down
. If
the devotee does not engage himself always in hearing and chanting the
topics of Krsna and His activities 
but instead indulges in idle talk,
there is every chance of his falling down
. If a neophyte devotee does
not follow the orders of the spiritual master and simply officially
sticks to the principles, or if he does not strictly follow the
principles, 
there is every possibility of his falling down. To become
greedy 
is another cause of falldownAnd to associate with persons who
are not in devotional service is the last word in maya’s allurements
for causing a devotee to fall down
.
On the other hand—if we follow the process this is what happens
SB 3.5.4 P–The bhakti process, as performed under the regulative principles of vaidhi-bhakti, or devotional service following the prescribed rules and regulations, is defined by the revealed scriptures and confirmed by great acaryas.This practice can help the neophyte devotee to rise to the stage of raga-bhakti, in which the Lord responds from within... when such a nondualist comes to sense that the Lord is worshipable and that the devotee is simultaneously one with and different from the Lord, then only can he surrender.

Dec 12 1970
Therefore, anyone who wants to make progress in spiritual life, he must be sadācāra. His behavior must be very regulated. Asadācārī, unclean, nonregulated, cannot make any progress. If somebody says that “Whatever you like, you can do. There is no difference. You can imagine your own way…” This is going on nowadays. “Whatever you like, you can do. You can imagine your own way of self-realization.” But that is not recommended in the Vedic literatures. One must be sadācāra. This is the beginning of sadācāra, to rise early in the morning, to cleanse, then chant, or chant the Vedic mantras or, simplified as in the present age, Hare Kṛṣṇa mantra, mahā-mantra. This is the beginning of sadācāra. So sadācāra means to become freed from sinful reaction. Unless one follows the regulative principles he cannot be freed. And unless one is fully freed from sinful reaction he cannot understand what is God.
SB 2.9.31 purport–
Therefore, one cannot understand the Personality of Godhead unless one becomes a devotee and discharges devotional service. This mystery is love of Godhead. Therein lies the main qualification for knowing the mystery of the Personality of Godhead. And to attain the stage of transcendental love of Godhead, regulative principles of devotional service must be followed. The regulative principles are called vidhi-bhakti, or the devotional service of the Lord, and they can be practiced by a neophyte with his present senses. Such regulative principles are mainly based on hearing and chanting of the glories of the Lord. And such hearing and chanting of the glories of the Lord can be made possible in the association of devotees onlyLord Caitanya therefore recommended five main principles for attaining perfection in the devotional service of the Lord. The first is association with devotees (hearing); second is chantingthe glories of the Lord; third, hearing Śrīmad-Bhāgavatam from the pure devotee; fourth, residing in a holy place connected with the Lord; and fifth, worshiping the Deity of the Lord with devotion. Such rules and regulations are parts of devotional service.
Madhya 19.157 purport–
While the bhakti-latā creeper is growing, the devotee must protect it by fencing it all around. The neophyte devotee must be protected by being surrounded by pure devotees. In this way he will not give the maddened elephant a chance to uproot his bhakti-latā creeper. When one associates with nondevotees, the maddened elephant is set loose. Śrī Caitanya Mahāprabhu has said: asat-saṅga-tyāga,-ei vaiṣṇava-ācāra.The first business of a Vaiṣṇava is to give up the company of nondevotees. A so-called mature devotee, however, commits a great offense by giving up the company of pure devotees. The living entity is a social animal, and if one gives up the society of pure devotees, he must associate with nondevotees (asat-saṅga).By contacting nondevotees and engaging in nondevotional activities, a so-called mature devotee will fall victim to the mad elephant offense. Whatever growth has taken place is quickly uprooted by such an offense. One should therefore be very careful to defend the creeper by fencing it in-that is, by following the regulative principles and associating with pure devotees.
If one thinks that there are many pseudo devotees or nondevotees in the Kṛṣṇa Consciousness Society, one can keep direct company with the spiritual master, and if there is any doubt, one should consult the spiritual master. However, unless one follows the spiritual master’s instructions and the regulative principles governing chanting and hearing the holy name of the Lord, one cannot become a pure devotee.By one’s mental concoctions, one falls down. By associating with nondevotees, one breaks the regulative principles and is thereby lost.
 
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