Gurukṛpā: I heard one scientist on the airplane. There were three scientists sitting behind me, and they were speaking that they hope they are living in the year 2000. One man said, "I become so excited when I think how advanced we will be in the year 2000 that I just hope I do not die before then, 'cause I want to see how everything will be then."
Satsvarūpa: By then they think they will be doing this, creating life.
Prabhupāda: That any insane man can say. Any crazy man can say. "Trust no future, however pleasant." "You are rascal. You are believing in the future. You have not show us. Because in the past you could not do—there is no history—in the present you cannot do. So how shall I believe that in future you'll do?" So any rascal promises like that, so we take him as a rascal. That's all.
Satsvarūpa: What about our promise, in the future also, that you go to Kṛṣṇa in the future?
Prabhupāda: We have got proof. Kṛṣṇa says; we believe in Kṛṣṇa. You believe in some rascal; we believe in Kṛṣṇa. That is the difference. Kṛṣṇa says, tyaktvā dehaṁ punar janma naiti mām eti (BG 4.9). So we believe that. That's all. We have got evidence. You have no evidence. You are simply suggesting in future you'll do. But we have got evidence.
Gargamuni: Sometimes they ask, "Show us somebody who's come."
Prabhupāda: Hmm?
Gargamuni: "Show us someone who has come from there."
Prabhupāda: Many.
Gargamuni: "But we don't find any."
Prabhupāda: Many. Many. It is in the śāstra. "He was formerly like this, and now he has become this." There are many.
Gargamuni: Well, that's in the śāstra. They say now we want . . .
Prabhupāda: But śāstra is the proof. Our proof is śāstra. Your proof is your śāstra. Did you go to the moon planet, or you believe the newspapers? Have you gone?
Gargamuni: No.
Prabhupāda: Then if you can believe newspaper, why shall I not believe in the Veda, Vedānta?
Gargamuni: No, but one man has come. They showed.
Prabhupāda: So one man . . . You have not done. You have no experience. So one man, you believe authority.