Vaidhi-bhakti means discharging devotional service under regulative principles. Without vaidhi-bhakti you cannot jump to raga-bhakti. Raga-bhakti is spontaneous. That does not require any regulative principles. Out of love, out of feeling, anyone wants to serve Krsna, that is called…. That is gopis. All the inhabitants of Vrndavana, they did not undergo any regulative principles. But spontaneously, they are always ready to serve God, Krsna. That is called raga-bhakti.
Just like a mother, as soon as there is child, baby, she takes care. She does not go to a school [to learn] how to take care of a child, but automatically she takes care. Similarly, this automatically serving Krsna, that is called raga-bhakti. That is reached by vidhi-bhakti, by practicing.
Just like formerly there was child marriage — a small boy, a small girl. But simply by association the girl understands how to serve the husband and the husband also understands 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.
Srila Prabhupada, Srimad-Bhagavatam 3.26.41 — January 16, 1975, Bombay