Prabhupāda: Sevonmukhe hi jihvādau (Brs. 1.2.234). By service only. You can understand God simply by service. There is no other way. And the faith begins from the tongue. You see? Therefore it is advised that you chant and take prasāda. Then faith will come. Sevonmukhe hi jihvādau. It begins . . . The faith begins from the tongue. "Why?" People will be surprised. "Faith must begin from the mind, from the eyes. And why it is said tongue?" They do not know. That is also faith, that "Simply engaging tongue in the service of the Lord, I shall understand." So this is also blind faith. But actually it is happening. Chant Hare Kṛṣṇa and take prasādam. That's all.
Yadubara: So most of these people, they are so ignorant that we should try to engage them in works of devotion rather than explain . . .
Prabhupāda: This is devotion: "Please come here, chant with me and dance with me, and when you are tired, take prasādam." That's all.
Jayādvaita: They had five thousand dollars' worth of faith yesterday in the prasādam.
Prabhupāda: (chuckles) Yes. So whatever is said in the śāstra . . . Now, they say, "Faith begins from the tongue." "No," it is surprising. How is that? But it is a fact.
Bharadvāja: So to encourage their faith, therefore the sādhu must set example of purity.
Prabhupāda: Sādhu śāstra guru vākya, tinete koriyā aikya. Guru-mukha-padma-vākya, cittete koriyā aikya, ār nā koriho mane āśā. Don't go anywhere else. Take this faithfully, the orders of guru. You are singing daily. Ār nā koriho mane āśā. This is faith, strong faith. And that is described in the Caitanya-caritāmṛta, śraddhā-śabde—viśvāsa śudṛdha niścaya (CC Madhya 22.62). Viśvāsa, firm faith. That is śraddhā. Faith means to believe strongly. That is faith.
Kṛṣṇadāsa: So actually, in regards to my father or atheists or scientists in general . . .
Prabhupāda: They are faithless.
Kṛṣṇadāsa: They will never believe.
Prabhupāda: They are faithless; therefore they will never make any progress. Their first principle is sacrifice. And in the śāstra it . . . ādau śraddhā: "First of all faith." And these rascals, they have no faith. Therefore they do not make any progress. And Rūpa Gosvāmī says, ādau śraddhā: "Begin with faith." So they cannot realize, condemned, because Kṛṣṇa will withdraw the knowledge. Mattaḥ smṛtir apohanaṁ ca (BG 15.15). So Kṛṣṇa will say, "Oh, this rascal is faithless. All right, make him more faithless. He will never understand." That is atheist.