(Srila Gaura Kisora dasa Babaji Maharaja)
Prabhupāda: ...Kṛṣṇa says, bahūnāṁ janmanām ante jñānavān māṁ prapadyate: (BG 7.19) "After many, many births of culture of knowledge, the person who has come to the highest point of knowledge, he surrenders unto Me." So similarly, if any person without any knowledge, if he surrenders only to Kṛṣṇa, he acquires all the knowledge. He has surpassed all stages. He has surpassed all stages. And that is also confirmed. If you say, "How he has gone, surpassed all stage?" That answer in Bhagavad-gītā you find,
aham ajñāna-jaṁ tamaḥ
Teṣām: "Because he is a devotee, just to give, just to show him a special favor," teṣām evānukampārtham, "simply for showing a special favor, I Myself, from within, I light up the knowledge, I mean to say, searchlight, and he becomes..."
And you will be surprised that my Guru Mahārāja's spiritual master was Gaura Kiśora dāsa Bābājī Mahārāja. He was completely illiterate. He did not know how to sign, and my spiritual master was the most learned man of his age. He accepted that guru who was completely illiterate. But when he would speak, that Gaura Kiśora dāsa Bābājī Mahārāja, he would speak with all Vedic references. And you will find in the Veda that
yasya deve parā bhaktir
yathā deve tathā gurau
tasyaite kathitā hy arthāḥ
So the spiritual knowledge becomes revealed. It is not subjected to any material acquisition. It is not subjected to any material acquisition of knowledge. It becomes revealed. How? Yasya deve parā bhaktir yathā deve tathā gurau. One who has a staunch faith in the Supreme Lord and staunch faith in the personality of his spiritual master, bona fide, then he gets all the things revealed in himself. Spiritual things are not just like material things.
So according to Bhagavad-gītā, sarva-guhyatamam, the Lord says that "The most confidential part of knowledge I am speaking to you, my dear Arjuna, because you are My very dear friend, that sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66)." So one who has the conception of the Supreme Personality of Godhead and has surrendered unto Him, he is considered to be highest, topmost spiritualist.
(Srila Prabhupada Lecture, New York, August 12, 1966)