As mentioned above, a person in Kṛṣṇa consciousness, being fully devoted to the transcendental loving service of the Lord, develops all the godly qualities of the demigods. There are many such qualities, but Lord Caitanya described only some of them to Sanātana Gosvāmī.
A devotee of the Lord is always kind to everyone; he does not pick quarrels. His interest is in the essence of life, which is spiritual. He is equal to everyone, no one can find fault in him, his magnanimous mind is always fresh and clean, and he is without material possessions. He is a benefactor to all living entities and is peaceful and always surrendered to Kṛṣṇa. He has no material desires. He is very humble and is fixed in his purpose. He is victorious over the six material qualities, such as lust and anger, and he does not eat more than he needs. He is always sane and is respectful to others, but he does not require respect for himself. He is grave, merciful, friendly, poetic, expert and silent.
Śrīmad-Bhāgavatam (3.25.21) also describes the person in Kṛṣṇa consciousness, one who is devoted to the loving service of the Lord. There the devotee is said to be always tolerant and merciful, and a friend to all living entities. He has no enemies, he is peaceful, and he possesses all good qualities. These are a few of the characteristics of a person in Kṛṣṇa consciousness.
It is also said in Śrīmad-Bhāgavatam (5.5.2) that if one gets the opportunity to serve a great soul—a mahātmā—his path to liberation is open. However, those who are attached to materialistic persons are on the path of darkness. Those who are actually holy are transcendentalists; they are equipoised, very peaceful, free from anger, and friendly to all living entities. Simply by association with such holy men one can become a Kṛṣṇa conscious devotee of the Lord. Indeed, to develop love of Godhead, the association of such great souls is needed. The path of advancement in spiritual life opens for anyone who comes in contact with such holy men, and by following their path, one is sure to develop Kṛṣṇa consciousness in full devotional service.
In the Eleventh Canto, Second Chapter, of Śrīmad-Bhāgavatam, Vasudeva, the father of Kṛṣṇa, asks Nārada Muni about the welfare of all living entities, and in reply Nārada Muni quotes a passage from Mahārāja Nimi's discussion with the nine sages. "O holy sages," King Nimi said, "I am just trying to find the path of well-being for all living entities. A moment of association with holy men is the most valuable thing in life, for that moment opens the path of advancement in spiritual life." (SB 11.2.30) This statement is confirmed elsewhere in Śrīmad-Bhāgavatam (3.25.25). By associating with holy persons and discussing transcendental subject matters with them, one becomes convinced of the value of spiritual life. Very soon, hearing of Kṛṣṇa becomes pleasing to the ear and begins to satisfy one's heart. After receiving such spiritual messages from holy persons, or pure devotees, if one tries to apply them in his own life, one naturally and successively develops faith, attachment and devotion while progressing on the path of Kṛṣṇa consciousness.
The Lord then informed Sanātana Gosvāmī about the behavior of a devotee. The sum and substance of such behavior is that one should always stay aloof from unholy association. And what is unholy association? It is association with one who is too much attached to women or one who is not a devotee of Lord Kṛṣṇa. These are unholy persons. One is thus advised to associate with holy devotees of the Lord and carefully avoid the association of unholy nondevotees. Pure devotees of Kṛṣṇa are very careful to keep aloof from the two kinds of nondevotees. The result of unholy association is described in Śrīmad-Bhāgavatam (3.31.33–35). There it is said that one should give up all association with a person who is a plaything for women, for by associating with such an unholy person one becomes bereft of all good qualities, such as truthfulness, cleanliness, mercy, gravity, intelligence, shyness, beauty, fame, forgiveness, control of the mind, control of the senses, and all the opulences that are automatically obtained by a devotee. A man is never so degraded as when he associates with persons who are too much attached to women.