SB 1.3 - The understanding of the devotees
Only those who render unreserved, uninterrupted, favorable service unto the scent of the lotus feet of Kṛṣṇa, who carries the wheel of the chariot in His hand, can know Him in full glory and transcendence. Here Sūta describes the pinnacle of realization of the Absolute Truth: Bhagavān, Śrī Kṛṣṇa. Being freed from the reactions of karma and mental speculation, the pure devotees can understand the transcendental name, form and activities of the Lord. Everyone within the creation of the Lord is rendering service to the Lord indirectly or directly. Those who render service indirectly are being forced by the illusory energy of the Lord and thus they render service unfavorably. But those who render service directly under the direction of His beloved agent are rendering service unto Him favorably. These devotees can enter into the mysterious region of transcendence by the mercy of the Lord. The mental speculators remain in darkness all the time. The Lord Himself guides the pure devotees toward the path of realization because of their constant engagement in the loving service of the Lord in spontaneous affection.
Only by making such inquiries as those done by the sages headed by Śaunaka, can one be successful, for such inquiries invoke love unto the Personality of Godhead, who is the proprietor of all the universes, and guarantee immunity from repeated birth and death. The word Bhagavān also means he who knows knowledge and ignorance. Thus bhagavantaḥ means knowledgeable sages (like Śaunaka) rather than great devotees, since they were not so advanced. Only the devotees can know the Lord to a considerable extent and so they are perfectly cognizant of all spiritual knowledge. The Personality of Godhead is the last word in the Absolute Truth. Impersonal Brahman and Supersoul are included in the knowledge of the Personality of Godhead. So one who knows the Lord can automatically know about Him, His multi potencies and His expansions.