The facilities of devotional service are denied the impersonalists because they are attached to the brahmajyoti feature of the Lord. As suggested in the previous mantras, they cannot penetrate the brahma-jyoti because they do not believe in the Personality of Godhead. Their business is mostly word jugglery and mental speculation. Consequently the impersonalists pursue a fruitless labor, as confirmed in the Twelfth Chapter of the Bhagavad-gītā (12.5).
All the facilities suggested in this mantra can be easily obtained by constant contact with the personal feature of the Absolute Truth. Devotional service to the Lord consists essentially of nine transcendental activities: (1) hearing about the Lord, (2) glorifying the Lord, (3) remembering the Lord, (4) serving the lotus feet of the Lord, (5) worshiping the Lord, (6) offering prayers to the Lord, (7) serving the Lord, (8) enjoying friendly association with the Lord, and (9) surrendering everything unto the Lord. These nine principles of devotional service-taken all together or one by one-help a devotee remain constantly in touch with God. In this way, at the end of life it is easy for the devotee to remember the Lord. By adopting only one of these nine principles, the following renowned devotees of the Lord were able to achieve the highest perfection: (1) By hearing of the Lord, Mahārāja Parīkṣit, the hero of Śrīmad-Bhāgavatam, attained the desired result. (2) Just by glorifying the Lord, Śukadeva Gosvāmī, the speaker of Śrīmad-Bhāgavatam, attained his perfection. (3) By praying to the Lord, Akrūra attained the desired result. (4) By remembering the Lord, Prahlāda Mahārāja attained the desired result. (5) By worshiping the Lord, Pṛthu Mahārāja attained perfection. (6) By serving the lotus feet of the Lord, the goddess of fortune, Lakṣmī, attained perfection. (7) By rendering personal service to the Lord, Hanumān attained the desired result. (8) Through his friendship with the Lord, Arjuna attained the desired result. (9) By surrendering everything he had to the Lord, Mahārāja Bali attained the desired result.
Actually, the explanation of this mantra and of practically all the mantras of the Vedic hymns is summarized in the Vedānta-sūtra and properly explained in Śrīmad-Bhāgavatam. Śrīmad-Bhāgavatam is the mature fruit of the Vedic tree of wisdom. In Śrīmad-Bhāgavatam this particular mantra is explained in the questions and answers between Mahārāja Parīkṣit and Śukadeva Gosvāmī at the very beginning of their meeting. Hearing and chanting of the science of God is the basic principle of devotional life. The complete Bhāgavatam was heard by Mahārāja Parīkṣit and chanted by Śukadeva Gosvāmī. Mahārāja Parīkṣit inquired from Śukadeva because Śukadeva was a greater spiritual master than any great yogī or transcendentalist of his time.