The whole process of transferring oneself to the spiritual sky involves gradually liquidating the material composition of the gross and subtle coverings of the spirit soul. The above-mentioned five items of devotional activities are so spiritually powerful that their performance by a devotee, even in the preliminary stage, can very quickly promote the sincere executor to the stage of bhāva (the stage just prior to love of Godhead), or emotion on the spiritual plane, which is transcendental to mental and intellectual functions. A complete absorption in bhāva, or love of God, makes one fit to be transferred to the spiritual sky just after leaving the material tabernacle. The perfection of love of God by a devotee actually situates him on the spiritual platform, even though he may still maintain a gross material body. He becomes like a red-hot iron which, when in contact with fire, actually ceases to be iron and acts like fire. These things are made possible by the Lord's inscrutable and inconceivable energy, which material science has not the scope to calculate. One should therefore engage himself in devotional service with absolute faith, and to make his faith steadfast one should seek the association of the standard devotees of the Lord by personal association (if possible) or by thinking of them. This association will help one develop factual devotional service to the Lord, which will cause all material misgivings to disappear like a flash of lightning. All these different stages of spiritual realization will be personally felt by the candidate, and this will create in him a firm belief that he is making positive progress on the way to the spiritual sky. Then he will become sincerely attached to the Lord and His abode. Such is the gradual process of evolving love of God, which is the prime necessity for the human form of life.
There are instances in history of great personalities, including sages and kings, who attained perfection by this process. Some of them attained success even by adhering to one single item of devotional service with faith and perseverance. Some of these personalities are listed below.
1. Emperor Parīkṣit attained the spiritual platform simply by hearing from such an authority as Śrī Śukadeva Gosvāmī.
2. Śrī Śukadeva Gosvāmī attained the same simply by recitation, verbatim, of the transcendental message which he received from his great father, Śrī Vyāsadeva.
3. Emperor Prahlāda attained spiritual success by remembering the Lord constantly, in pursuance of instructions given by Śrī Nārada Muni, the great saint and devotee.
4. Lakṣmījī, the goddess of fortune, attained success simply by sitting and serving the lotus feet of the Lord.
5. King Pṛthu attained success simply by worshiping the Lord.
6. Akrūra, the charioteer, attained success simply by chanting prayers for the Lord.
7. Hanumān (Mahāvīra), the famous nonhuman devotee of Lord Śrī Rāmacandra, attained success simply by carrying out the orders of the Lord.
8. Arjuna, the great warrior, attained the same perfection simply by making friends with the Lord, who delivered the message of Bhagavad-gītā to enlighten Arjuna and his followers.
9. Emperor Bali attained success by surrendering everything unto the Lord, including his personal body.