These items are especially mentioned by Rūpa Gosvāmī in his book Bhakti-rasāmṛta-sindhu. The thirty-nine items above, plus these five items, total forty-four items. Add to these the twenty preliminary items and there are a total of sixty-four items for conducting devotional service. The devotional service of one who adopts these sixty-four items with his body, mind and senses gradually becomes pure. Some of the items are completely distinct from others, some are identical, and others appear to be mixed.
Śrīla Rūpa Gosvāmī has recommended that one live in the association of those who are of the same mentality; therefore it is necessary to form some association for Kṛṣṇa consciousness and live together for the cultivation of knowledge of Kṛṣṇa and devotional service.