Prabhupāda: Just like people are trying. The same thing which they have got at home... Just like a naked woman. They are still going to the theater to see naked dance. You see? What is that? They have no idea. The same thing. Punaḥ punaś carvita-carvaṇānām (SB 7.5.30), chewing the chewed, trying to find out in which naked dance there is pleasure. That's all. So when one comes to the knowledge that "I have seen so many different types of naked dance and naked woman. What I have got? What I have gained? What satisfaction is there? Why I am not satisfied?" That is knowledge. That is knowledge.
Just like Bilvamaṅgala Ṭhākura. You have heard the story of Bilvamaṅgala Ṭhākura. There are many stories. So he was very much fond of his girlfriend prostitute. So when one night when he approached there within torrents of rain and with great difficulties, the woman was sympathetic. She said, "Bilvamaṅgala, you are so much attracted with this flesh and bone. Oh, if you had been so much attracted to Kṛṣṇa, how you would have been." Oh, immediately he turned: "Yes." So he immediately went back and went to Vṛndāvana.
So these are the points of knowledge. You see? One... When one is struck with that knowledge, that "What I have gained? I have tried life after life, hours after hours, days after days, this sense gratification. What I have got?" this is knowledge. Then searching begins. Go on.
Revatīnandana: "But ignorant and faithless persons who doubt the revealed scriptures go to ruin and perish. For the doubting soul there is happiness neither in this world nor in the next."
Prabhupāda: Yes. One who is doubtful, he has neither happiness in this world, and what to speak of the next?
Revatīnandana: "Therefore, one who has renounced the fruits of his actions, whose doubts are destroyed by transcendental knowledge, and who is situated firmly in the self is not bound by works, O conqueror of riches." Purport: "One who follows the instruction of the Bhagavad-gītā as it is imparted by the Lord, the Personality of Godhead Himself, becomes free from all doubts by grace of transcendental knowledge."
Prabhupāda: Because everything is threadbare explained. You can have answer of all questions from this Bhagavad-gītā, chapter by chapter. Everything is completely understood. Yes.