By this plea, we can understand that liberation is not the final word in perfection. There must be activities in liberation. Sanātana clearly says, "You have saved me from the material existence. Now, after liberation, what is my duty?" Sanātana further inquired, "Who am I? Why are the threefold miseries always giving me trouble? And finally, tell me how I can be relieved from this material entanglement? I do not know how to question You about the advancement of spiritual life, but I beg that You kindly, mercifully, let me know everything that I need know."
This is the process of accepting a spiritual master. One should approach a spiritual master, humbly submit to him and then inquire from him about one's spiritual progress.
The Lord was pleased by Sanātana's submissive behavior, and He replied, "You have already received benediction from Lord Kṛṣṇa, and therefore you know everything and are free from all the miseries of material existence." The Lord further pointed out that because Sanātana was in Kṛṣṇa consciousness, he was naturally, by the grace of Kṛṣṇa, already conversant with everything. "Because you are a humble devotee," the Lord continued, "you are asking Me to confirm what you already know. This is very nice." These are the characteristics of a true devotee. In the Nārada-bhakti-sūtra it is said that one who is very serious about developing Kṛṣṇa consciousness has his desire to understand Kṛṣṇa fulfilled very soon by the grace of the Lord.