So Kṛṣṇa is ready to accept our service in so many ways. Either if you cannot establish Deity, then you simply hear about Him. That is the most important thing. We do not require to establish temple everywhere. If there is possible to establish temple and serve Kṛṣṇa properly according to the regulation mentioned in the śāstras or instructed by the spiritual master, that is called vaidhī-bhakti. Vaidhī-bhakti. Vaidhī-bhakti means discharging devotional service under regulative principles. So without vaidhī-bhakti, you cannot jump to the rāga-bhakti. Rāga-bhakti is spontaneous. That does not require any regulative principles. Out of love, out of feeling anyone wants to serve Kṛṣṇa. That is called..., that is gopīs. All the inhabitants of Vṛndāvana, they did not undergo any regulative principles. But spontaneously, they are always ready to serve God, Kṛṣṇa. That is called rāga-bhakti. Just like to... The example... There are examples. Just like a mother, as soon as there is child, baby, she takes care. She takes care. Although she does not go to a school how to take care of a child, but automatically. Automatically she takes care. Similarly, this automatically serving Kṛṣṇa, that is called rāga-bhakti. That is reached by vaidhī-bhakti, by practicing. Just like formerly there was marriage, child marriage—a small boy, a small girl. But simply by association the girl understands how to serve the husband and the husband also understand how to give protection to the wife, and mostly, the life was very pleasing, happy. From the very beginning she knows, "Here is my husband," and he knows, "Here is my wife." At least we have seen in our India. There is no question of separation. There is no question of divorce. The love is there from the very beginning. The propensity was there and immediately the object of love is there. A girl has got husband; a husband has got a wife. So the love continues spontaneously.
(Lecture on Srimad Bhagavatam-3:26:41--Bombay, 16th. January, 1975).

The next stage in the process of elevation to love of God is sādhu-saṅga (CC-2:22:83), association with persons already in the highest stage of love of God. One who avoids such association and simply engages in mental speculation or so-called meditation cannot be raised to the perfectional platform. But one who associates with pure devotees or an elevated devotional society goes to the next stage—bhajana-kriyā, or acceptance of the regulative principles of worshiping the Supreme Lord. One who associates with a pure devotee of the Lord naturally accepts that person as his spiritual master, and when the neophyte devotee accepts a pure devotee as his spiritual master, the duty of the spiritual master is to train the neophyte in the principles of regulated devotional service, or vaidhi-bhakti. At this stage the devotee's service is based on his capacity to serve the Lord. The expert spiritual master engages his followers in work that will gradually develop their consciousness of service to the Lord. Therefore the preliminary stage of understanding prema, love of God, is to approach a proper pure devotee, accept him as one's spiritual master, and execute regulated devotional service under his guidance.
(Narada Bhakti Sutra--purport).

Now this sādhana-bhakti, or practice of devotional service, may also be divided into two parts. The first part is called service according to regulative principles: one has to follow these different regulative principles by the order of the spiritual master or on the strength of authoritative scriptures, and there can be no question of refusal. That is called vaidhi, or regulated. One has to do it without argument. Another part of sādhana-bhakti is called rāgānugā. Rāgānugā refers to the point at which, by following the regulative principles, one becomes a little more attached to Kṛṣṇa and executes devotional service out of natural love. For example, a person engaged in devotional service may be ordered to rise early in the morning and offer ārati, which is a form of Deity worship. In the beginning, by the order of his spiritual master, one rises early in the morning and offers ārati, but then he develops real attachment. When he gets this attachment, he automatically tries to decorate the Deity and prepare different kinds of dresses and thinks of different plans to execute his devotional service nicely. Although it is within the category of practice, this offering of loving service is spontaneous. So the practice of devotional service, sādhana-bhakti, can be divided into two parts—namely, regulative and spontaneous. (Nectar of Devotion).