There are three stages of devotional service: The first is the beginning stage of cultivation, the second is the realization of service, and the third, the supreme stage, is the attainment of love of Godhead. There are nine different methods of cultivating devotional service—hearing, chanting, remembering, etc.—and all these processes are employed by the neophyte in the first stage. If one is engaged in chanting and hearing with devotion and faith, his material misgivings gradually become vanquished. As his faith in devotional service increases more and more, he becomes assured of a higher perfectional position. In this way one becomes firmly fixed in devotional service, increases his taste for it, becomes attached to it, and feels ecstasy, the preliminary stage of love of Godhead. Attainment of ecstasy is produced by executing this process of cultivating devotional service. When one continues the process of hearing and chanting, attachment to Kṛṣṇa gradually thickens and at last is called love of Godhead.
In the stage of transcendental love of God there are further developments, known as transcendental affection, emotion, ecstasy, and extreme and intense attachment. These are technically known by the terms rāga, anurāga, bhāva and mahābhāva. The progress from one stage to another is like the thickening of sugarcane juice. In the first stage sugarcane juice is a thin liquid. When, by evaporation, it becomes thicker and thicker, it turns into molasses. Then it turns into granules of sugar, then rock candy, and so on. Just as sugarcane juice progresses from one stage to another, similarly transcendental love for the Supreme Lord develops by stages.