Sutra 40
With the proper development of renunciation one attains active devotional service (sadhana), then ecstasy (bhava) and finally pure love (prema) for the Lord.
Commentary by Srila Bhaktivinoda Thakura
Here someone may ask: What are the different levels of advancement in devotional service? To answer this question the author speaks this sutra. By regular practice one makes advancement in renunciation and devotional service (sadhana), then ecstasy (bhava), and finally pure love (prema) for the Lord. Thus, with the proper development of renunciation, one makes advancement in devotional service, culminating in ecstasy and pure devotional love. The Supreme Personality of Godhead explains (Bhagavad-gita 9.9): "Follow the regular principles of bhakti-yoga. In this way you will develop a desire to attain Me."
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The physical body is made up of countless numbers of tiny material particles called molecules and atoms. These material particles are constantly being replaced by material particles from the outside environment (in the form of food, water, air, and so on). Over a period of five to seven years, this process of metabolism brings about a complete change of the matter that makes up your body.
Siddhaswarupananda - Chris Butler Speaks
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In Bhakti-rasamrta-sindhu (1.2.1-2) Srila Rupa Gosvami explains:
"The three categories of devotional service are: 1. devotional service in practice (sadhana), 2. devotional service in ecstasy (bhava) and 3. devotional service in pure love of Godhead (prema). When we wish to develop our innate capacity for devotional service, there are certain processes which, by our accepting and executing them, will cause that dormant capacity to be invoked. Such practice is called sadhana-bhakti."
In Bhakti-rasamrta-sindhu, Srila Rupa Gosvami again explains:
"With vibhava and the other features of ecstatic love, one experiences the greatest and most wonderful bliss."
In Bhakti-rasamrta-sindhu (1.4.15-16) Srila Rupa Gosvami again explains:
"In the beginning there must be faith. Then one becomes interested in associating with pure devotees. Thereafter one is initiated by the spiritual master and executes the regulative principles under his orders. Thus one is freed from all unwanted habits and becomes firmly fixed in devotional service. Thereafter one develops taste and attachment. This is the way of sadhana-bhakti, the execution of devotional service according to the regulative principles. Gradually emotions intensify and finally there is an awakening of love. This is the gradual development of love of Godhead for a devotee interested in Krsna consciousness."p>