Ecstatic love of Godhead can be potently invoked simply by following the rules and regulations of devotional service as they are prescribed in scriptures, under the direction of a bona fide spiritual master. In the Eleventh Canto, 2nd Chapter, 38th verse, of the Śrīmad-Bhāgavatam this ecstatic love, born of the execution of regulative devotional service, is explained: "A devotee, in the course of executing the regulative principles of devotional service, develops his natural Kṛṣṇa consciousness, and being thus softened at heart he chants and dances like a madman. While performing chanting of the holy name of the Lord, he sometimes cries, sometimes talks wildly, sometimes sings, and sometimes—without caring for any outsider—dances like a madman."
In the Padma Purāṇa there is a statement about ecstatic love born of spontaneous affection. Candrakānti, a celebrated fair-faced girl, rigidly observed celibacy in order to obtain Kṛṣṇa as her husband. She always engaged herself in meditating on the transcendental form of the Lord and always chanted the glories of the Lord. She did not desire to accept anyone else as her husband. She had firmly decided that only Lord Kṛṣṇa would be her husband.
The Lord's Extraordinary Mercy
When a devotee is found to be always associated with the Lord in ecstatic love, it is to be understood that such a position is awarded by the Lord Himself out of His causeless extraordinary mercy. An example of such extraordinary mercy is given in the Eleventh Canto, 12th Chapter, 6th verse, of the Śrīmad-Bhāgavatam, wherein Lord Kṛṣṇa tells Uddhava: "The gopīs in Vṛndāvana did not study the Vedas to achieve Me. Nor had they ever been in holy places of pilgrimage. Nor did they devoutly execute any regulative principle. Nor did they undergo any kind of austerity. It is simply by My association that they have attained the highest perfection of devotional service."
From the example of Candrakānti as found in the Padma Purāṇa and from the example of the gopīs as found in the Śrīmad-Bhāgavatam, it appears that a devotee who always thinks of Kṛṣṇa and who always chants His glories in ecstatic love, regardless of his condition, will attain the highest perfection of unalloyed devotional love due to Lord Kṛṣṇa's extraordinary mercy. This is confirmed in the Śrīmad-Bhāgavatam: "If Hari, the Supreme Lord, is worshiped, adored and loved by a person, it should be understood that the person has finished all kinds of austerities, penances and similar processes for self realization. On the other hand, if after undergoing all types of austerities, penances and mystic yoga practices, one does not develop such love for Hari, then all his performances are to be considered a useless waste of time. If someone always sees Kṛṣṇa inside and out, then it is to be understood that he has surpassed all austerities and penances for self realization. And if, after executing all kinds of penances and austerities, one cannot always see Kṛṣṇa inside and out, then he has executed his performances uselessly."