Text 17]
What Prahlāda Learned in the Womb
57
bhaktyā mām abhijānāti yāvān yaś cāsmi tattvataḥ tato māṁ tattvato jñātvā viśate tad-anantaram
“One can understand the Supreme Personality as He is only by devotional service. And when one is in full consciousness of the Supreme Lord by such devotion, he can enter into the kingdom of God.” (Bg. 18.55)
These are Vedic instructions. One must have full faith in the words of the spiritual master and similar faith in the Supreme Personality of Godhead. Then the real knowledge of  ātmā  and Paramātmā and the distinction between matter and spirit will be automatically revealed. This  ātma-tattva , or spiritual knowledge, will be revealed within the core of a devotee’s heart because of his having taken shelter of the lotus feet of a  mahājana  such as Prahlāda Mahārāja.
In this verse the word  bhūyāt  may be understood to mean “let there be.” Prahlāda Mahārāja offers his blessings to his class friends, saying, “Also become faithful like me. Become bona fide Vaiṣṇavas.” A devotee of the Lord desires for everyone to take to Krṣṇa consciousness. Unfortunately, however, people sometimes do not have staunch faith in the words of the spiritual master who comes by the disciplic succession, and therefore they are unable to understand transcendental knowledge. The spiritual master must be in the line of authorized disciplic succession, like Prahlāda Mahārāja, who received the knowledge from Nārada. If the class friends of Prahlāda Mahārāja, the sons of demons, were to accept the truth through Prahlāda, they would certainly also become fully aware of transcendental knowledge.
The words  vaiśāradī dhīḥ  refer to intelligence concerning the Supreme Personality of Godhead, who is extremely expert. The Lord has created wonderful universes by His expert knowledge. Unless one is extremely expert, he cannot understand the expert management of the supreme expert. One can understand, however, if one is fortunate enough to meet a bona fide spiritual master coming in the disciplic succession from Lord Brahmā, Lord Śiva, Mother Lakṣmī or the Kumāras. These four  sampradāyas , or disciplic successions of knowledge and transcendence, are called the Brahma-sampradāya, Rudra-sampradāya,