"My dear Lord, there are many instances in the history of human society where a person, after failing to achieve the transcendental platform, engaged himself in devotional service with his body, mind and words and thus attained the highest perfectional state of entering into Your abode. The processes of understanding You by speculation or mystic meditation are all useless without devotional service. One should therefore engage himself in Your devotional service even in his worldly activities, and one should always keep himself near You by the process of hearing and chanting Your transcendental glories. Simply by being attached to hearing and chanting Your glories, one can attain the highest perfectional stage of entering into Your kingdom. If a person, therefore, always keeps in touch with You by hearing and chanting Your glories and offers the results of his work for Your satisfaction only, he very easily and happily attains entrance into Your supreme abode. You are realizable by persons who have cleansed their hearts of all contamination. This cleansing of the heart is made possible by chanting and hearing the glories of Your Lordship."
The Lord is all-pervading. As it is stated by Lord Kṛṣṇa in the Bhagavad-gītā, "Everything is sustained by Me, but at the same time I am not in everything." Since the Lord is all-pervading, there is nothing existing without His knowledge. The all-pervasive nature of the Supreme Personality of Godhead can never be within the limited knowledge of a living entity; therefore, a person who has attained steadiness of the mind by fixing the mind on the lotus feet of the Lord is able to understand the Supreme Lord to some extent. It is the business of the mind to wander over varied subject matter for sense gratification. Therefore only a person who always engages the senses in the service of the Lord can control the mind and be fixed at the lotus feet of the Lord. This concentration of the mind upon the lotus feet of the Lord is called samādhi. Until one reaches the stage of samādhi, or trance, he cannot understand the nature of the Supreme Personality of Godhead. There may be some philosophers or scientists who can study the cosmic nature from atom to atom; they may be so advanced that they can count the atomic composition of the cosmic atmosphere or all the planets and stars in the sky, or even the shining molecular particles of the sun or of the stars and other luminaries in the sky. But it is not possible to count the qualities of the Supreme Personality of Godhead.