A Vaiṣṇava, therefore, should be fully qualified. As stated in the Bhāgavatam, anyone who has become a Vaiṣṇava has developed all the good qualities of the demigods. There are twenty-six qualifications mentioned in the Caitanya-caritāmṛta. A devotee should always see that his Vaiṣṇava qualities increase with the advancement of his Kṛṣṇa consciousness. A devotee should be blameless because any offense by the devotee is a scar on the Supreme Personality of Godhead. The devotee's duty is to be always conscious in his dealings with others, especially with another devotee of the Lord.
(Srimad Bhagavatam----3:16:5----purport).

According to the Bhāgavatam conclusion, we are sometimes faced with dangerous or miserable conditions without endeavoring for them, and similarly we may have prosperous conditions without endeavoring for them. We are advised to let these things come as predestined. We should engage our valuable time in prosecuting Kṛṣṇa consciousness. In other words, one should be satisfied by his natural condition. If by predestination one is put into a certain condition of life which is not very prosperous in comparison to another's position, one should not be disturbed. He should simply try to utilize his valuable time to advance in Kṛṣṇa consciousness. Advancement in Kṛṣṇa consciousness does not depend on any materially prosperous or distressed condition; it is free from the conditions imposed by material life. A very poor man can execute Kṛṣṇa consciousness as effectively as a very rich man. One should therefore be very satisfied with his position as offered by the Lord.
(Srimad Bhagavatam----3:27:8----purport).

A devotee should be friendly to everyone, but his intimate friendship should be with devotees only. With others he should be official. He may say, "Yes, sir, what you say is all right," but he is not intimate with them. A devotee should, however, have compassion for persons who are innocent, who are neither atheistic nor very much advanced in spiritual realization. A devotee should be compassionate towards them and instruct them as far as possible in making advancement in Kṛṣṇa consciousness. A devotee should always remain ātmavān, or situated in his spiritual position. He should not forget that his main concern is to make advancement in spiritual consciousness, or Kṛṣṇa consciousness, and he should not ignorantly identify himself with the body or the mind. Ātmā means the body or the mind, but here the word ātmavān especially means that one should be self-possessed. He should always remain in the pure consciousness that he is spirit soul and not the material body or the mind. That will make him progress confidently in Kṛṣṇa consciousness.
(Srimad Bhagavatam----3:27:8----purport).

The restriction of association with such foolish persons is especially meant for those who are in the line of advancement in Kṛṣṇa consciousness. Advancement in Kṛṣṇa consciousness involves developing the qualities of truthfulness, cleanliness, mercy, gravity, intelligence in spiritual knowledge, simplicity, material opulence, fame, forgiveness, and control of the mind and the senses. All these qualities are to be manifested with the progress of Kṛṣṇa consciousness, but if one associates with a śūdra, a foolish person who is like a dancing dog in the hands of a woman, then he cannot make any progress. Lord Caitanya has advised that any person who is engaged in Kṛṣṇa consciousness and who desires to pass beyond material nescience must not associate himself with women or with persons interested in material enjoyment. For a person seeking advancement in Kṛṣṇa consciousness, such association is more dangerous than suicide.
(Srimad Bhagavatam----3:31:34----purport).

When a devotee is completely purified, he becomes anyābhilāṣitā-śūnya. In other words, all of his material desires become zero, being burnt to ashes, and he exists either as the Lord's servant, friend, father, mother or conjugal lover. Because one thinks constantly in this way, one's present material body and mind are fully spiritualized, and the needs of one's material body completely vanish from one's existence. An iron rod put into a fire becomes warmer and warmer, and when it is red hot it is no longer an iron rod but fire. Similarly, when a devotee constantly engages in devotional service and thinks of the Lord in his original Kṛṣṇa consciousness, he no longer has any material activities, for his body is spiritualized.Advancement in Kṛṣṇa consciousness is very powerful, and therefore even during this life such a devotee has achieved the shelter of the lotus feet of the Lord. This transcendental ecstatic existence of a devotee was completely exhibited by Śrī Caitanya Mahāprabhu.
(Srimad Bhagavatam----7:7:36----purport).

In the conditioned state our senses are covered by material sense gratification, and as long as one is not trained in purifying the senses, one cannot become a devotee. In our Kṛṣṇa consciousness movement, therefore, we advise from the very beginning that one restrict the activities of the senses, especially the tongue, which is described by Śrīla Bhaktivinoda Ṭhākura as most greedy and unconquerable. To stop this attraction of the tongue, one is authoritatively advised not to accept meat or similar uneatable things nor to allow the tongue to hanker to drink or smoke. Even the drinking of tea and coffee is not permitted. Similarly, the genitals must be restricted from illicit sex. Without such restraint of the senses, one cannot make advancement in Kṛṣṇa consciousness. The only method of controlling the senses is to chant and hear the holy name of the Lord; otherwise, one will always be disturbed, as a householder with more than one wife would be disturbed by them for sense gratification.
(Srimad Bhagavatam----7:9:40----purport).

When one is Kṛṣṇa conscious, he gets more and more happiness by discharging duties for Kṛṣṇa. Such a person spits on sense gratification, especially that of sexual enjoyment. An experienced, advanced devotee is no longer interested in sex life. The strong desire for sex can be subdued only by advancement in Kṛṣṇa consciousness.
(Srimad Bhagavatam----9:19:16----purport).

One begins spiritual activities for advancement in Kṛṣṇa consciousness by hearing. Hearing is the most important method for advancement, and one should be very eager to hear favorably about Kṛṣṇa. Giving up all speculation and fruitive activity, one should simply worship and desire to attain to love of God. That love of God is eternally existing within everyone; it simply has to be evoked by the process of hearing. Hearing and chanting are the principal methods of devotional service.
(Teachings of Lord Caitanya).

Advancement in Kṛṣṇa consciousness depends on the attitude of the follower. A follower of the Kṛṣṇa consciousness movement should become a perfect gosvāmī. Vaiṣṇavas are generally known as gosvāmīs. In Vṛndāvana, this is the title by which the director of each temple is known. One who wants to become a perfect devotee of Kṛṣṇa must become a gosvāmī. Go means "the senses," and svāmī means "the master." Unless one controls his senses and mind, one cannot become a gosvāmī. To achieve the highest success in life by becoming a gosvāmī and then a pure devotee of the Lord, one must follow the instructions known as Upadeśāmṛta, which have been given by Śrīla Rūpa Gosvāmī.
(Nectar of Instruction).

The chanting of the holy names of Kṛṣṇa is so sublime that if one chants the Hare Kṛṣṇa mahā-mantra offenselessly, carefully avoiding the ten offenses, he can certainly be gradually elevated to the point of understanding that there is no difference between the holy name of the Lord and the Lord Himself. One who has reached such an understanding should be very much respected by neophyte devotees. One should know for certain that without chanting the holy name of the Lord offenselessly, one cannot be a proper candidate for advancement in Kṛṣṇa consciousness.
(Nectar of Instruction).

King Indra's behavior toward Kṛṣṇa was not very much appreciated by great sages like Śukadeva Gosvāmī. Out of His causeless mercy, Kṛṣṇa had gone to the heavenly kingdom, Amarāvatī, to present King Indra with his mother's earrings, which had been lost to Bhaumāsura, and Indra had been very glad to receive them. But when a pārijāta tree from the heavenly kingdom was taken by Kṛṣṇa, Indra had fought with Him. This was self-interest on the part of Indra. He had offered his prayer, tipping down his head to the lotus feet of Kṛṣṇa, but as soon as his purpose had been served, he became a different creature. That is the way of the dealings of materialistic men. Materialistic men are always interested in their own profit. For this purpose they can offer any kind of respect to anyone, but when their personal interest is over, they are no longer friends. This selfish nature is found not only among the richer class of men on this planet but even in personalities like Indra and other demigods. Too much wealth makes a man selfish. A selfish man is not prepared to take to Kṛṣṇa consciousness and is condemned by great devotees like Śukadeva Gosvāmī. In other words, possession of too many worldly riches is a disqualification for advancement in Kṛṣṇa consciousness.
(Krsna Book).

Akrūra continued: "My dear Dhṛtarāṣṭra, I beg to advise you not to be blind to the facts of material existence. Material, conditioned life, either in distress or in happiness, is to be accepted as a dream. One should try to bring his mind and senses under control and live peacefully for spiritual advancement in Kṛṣṇa consciousness." In the Caitanya-caritāmṛta it is said that except for persons in Kṛṣṇa consciousness, everyone is always disturbed in mind and full of anxiety. Even those trying for liberation, or merging into the Brahman effulgence, or the yogīs who try to achieve perfection in mystic power cannot have peace of mind. Pure devotees of Kṛṣṇa have no demands to make of Kṛṣṇa. They are simply satisfied with service to Him. Actual peace and mental tranquillity can be attained only in perfect Kṛṣṇa consciousness.
(Krsna Book).

Kṛṣṇa consciousness is so powerful that it gives everyone relief from all material activities. Śrīla Rūpa Gosvāmī has written a very nice verse wherein one gopī advises another, "My dear friend, if you desire to enjoy the company of material society, friendship and love, then please do not go to see this smiling boy Govinda, who is standing on the bank of the Yamunā and playing His flute, His lips brightened by the beams of the full moonlight." Śrīla Rūpa Gosvāmī indirectly instructs that one who has been captivated by the beautiful smiling face of Kṛṣṇa has lost all attraction for material enjoyments. This is the test of advancement in Kṛṣṇa consciousness: a person advancing in Kṛṣṇa consciousness must lose interest in material activities and personal sense gratification.
(Krsna Book).

Naturally, genital agitation follows, and one seeks illicit sex. However, if one is fixed at the lotus feet of Kṛṣṇa, he can control the tongue. Bhaktivinoda Ṭhākura further states, kṛṣṇa baḍa dayāmaya, karibāre jihvā jaya, sva-prasāda-anna dilā bhāi: in order to conquer the tongue, Kṛṣṇa has been very merciful and has given us nice food that has been offered to Him. When a person is attached to Kṛṣṇa's lotus feet, he does not eat anything not offered to Kṛṣṇa. Sei annāmṛta khāo, rādhā-kṛṣṇa-guṇa gāo, preme ḍāka caitanya-nitāi. Since a devotee eats only prasādam, he conquers the dictations of the tongue, belly and genitals. One can control the dictates of the senses when situated in the position of śānta-rasa. Then one's advancement in Kṛṣṇa consciousness is assured.
(Sri Caitanya Caritamrta----2:19:213----purport).

The Lord said to Mahārāja Yudhiṣṭhira, "The first installment of My mercy toward a devotee is that I take away all his possessions, especially his material opulence, his money." This is the special favor of the Lord toward a sincere devotee. If a sincere devotee wants Kṛṣṇa above everything but at the same time is attached to material possessions, which hinder his advancement in Kṛṣṇa consciousness, by tactics the Lord takes away all his possessions. Here Śukrācārya says that this dwarf brahmacārī would take away everything. Thus he indicates that the Lord will take away all one's material possessions and also one's mind. If one delivers his mind to the lotus feet of Kṛṣṇa (sa vai manaḥ kṛṣṇa-padāravindayoḥ (S.B.9:4:18), one can naturally sacrifice everything to satisfy Him. Although Bali Mahārāja was a devotee, he was attached to material possessions, and therefore the Lord, being very kind to him, showed him special favor by appearing as Lord Vāmana to take away all his material possessions, and his mind as well.
(Srimad Bhagavatam----8:19:32----purport).

Prahlāda Mahārāja's smiling is very significant. The other students were very much advanced in enjoying materialistic life through religion, economic development and sense gratification, but Prahlāda Mahārāja laughed at them, knowing that this was not actual happiness, for real happiness is advancement in Kṛṣṇa consciousness. The duty of those who follow in the footsteps of Prahlāda Mahārāja is to teach the entire world how to be Kṛṣṇa conscious and thus be really happy. Materialistic persons take to so-called religion to get some blessings so that they can improve their economic position and enjoy the material world through sense gratification. But devotees like Prahlāda Mahārāja laugh at how foolish they are to be busy in a temporary life without knowledge of the soul's transmigration from one body to another.
(Srimad Bhagavatam----7:5:55----purport).

Kaśyapa Muni's first instruction to his wife was not to be envious. The general tendency of anyone within this material world is to be envious, and therefore, to become a Kṛṣṇa conscious person, one must curb this tendency, as stated in Śrīmad-Bhāgavatam (paramo nirmatsarāṇām (S.B.1:1:2). A Kṛṣṇa conscious person is always nonenvious, whereas others are always envious. Thus Kaśyapa Muni's instruction that his wife not be envious indicates that this is the first stage of advancement in Kṛṣṇa consciousness. Kaśyapa Muni desired to train his wife to be a Kṛṣṇa conscious person, for this would suffice to protect both her and Indra.
(Srimad Bhagavatam----6:18:47----purport).

Kuntīdevī, while offering prayers to Kṛṣṇa, addressed Him as akiṣcana-gocara, one who is easily approached by those who are bereft of all material acquisitions. Material exhaustion is an advantage for advancement in Kṛṣṇa consciousness, although if one is conscious of his eternal relationship with the Supreme Personality of Godhead, one can utilize one's material assets, such as great learning and beauty and exalted ancestry, for the service of the Lord; then such assets become glorious. In other words, unless one is Kṛṣṇa conscious, all his material possessions are zero, but when this zero is by the side of the Supreme One, it at once increases in value to ten. Unless situated by the side of the Supreme One, zero is always zero; one may add one hundred zeros, but the value will still remain zero. Unless one's material assets are used in Kṛṣṇa consciousness, they may play havoc and degrade the possessor.
(Srimad Bhagavatam----4:3:17----purport).