Associations with devotees-the Effects
SB purport–The significant point in Dhruva Mahārāja’s statement is that he wanted the association of pure devotees. Transcendental devotional service cannot be complete and cannot be relishable without the association of devotees. We have therefore established the International Society for Krishna Consciousness. Anyone who is trying to be aloof from this Krishna Consciousness Society and yet engage in Kṛṣṇa consciousness is living in a great hallucination, for this is not possible. From this statement by Dhruva Mahārāja it is clear that unless one is associated with devotees, his devotional service does not mature; it does not become distinct from material activities.
SB 3.25.20 purport-…Mahātmā is a synonym of sādhu. It is said that service to a mahātmā, or elevated devotee of the Lord, is dvāram āhur vimukteḥ, the royal road of liberation. Mahat-sevāṁ dvāram āhur vimuktes tamo-dvāraṁ yoṣitāṁ saṅgi-saṅgam (Bhāg. 5.5.2). Rendering service to the materialists has the opposite effect. If anyone offers service to a gross materialist, or a person engaged only in sense enjoyment, then by association with such a person the door to hell is opened. … If we want to associate with a sādhu, we cannot expect him to give us instructions on how to improve our material condition, but he will give us instructions on how to cut the knot of the contamination of material attraction and how to elevate ourselves in devotional service. That is the result of associating with a sādhu.
March 28 1966 NY lecture-
This is called sato vṛtti, sat-saṅga. Sat-saṅga means association with good persons who are engaged, if not cent percent, at least engaged, certain portion of his life for spiritual realization.
So these six things are required for making progress in spiritual life. Similarly, there are six other things also which will degrade us from the spiritual life.