Puṣṭa Kṛṣṇa: Is it necessary from time to time to change the smṛtis?
Prabhupāda: That cannot be changed.
Puṣṭa Kṛṣṇa: Smṛti cannot be changed?
Prabhupāda: Nothing can be changed. But according to the time you have to... Just like in Kali-yuga the smṛti order is kīrtanād eva kṛṣṇasya mukta-saṅgaḥ paraṁ vrajet (SB 12.3.51). So you have to do this. Just like a physician gives a medicine that "Morning you take this medicine, in the evening you take this medicine." It is not a change of treatment. It is according to the time a different medicine. But it is recommended by the physician, not by your whims. Śruti-smṛti cannot be changed, but they have recommended different process in different times. So the reference to the śruti-smṛti is there, authority is there. It is... You cannot modify.
Puṣṭa Kṛṣṇa: There is no question then of, as he says, "new smṛti."
Prabhupāda: No. New smṛti, they may take it, "new smṛti." But smṛti is smṛti. It is not new. You have to give reference to the past śruti-smṛti. Otherwise, it is not... Veda pramāṇa, śabda pramāṇa. Otherwise there is no evidence. It is invalid, not valid. You cannot change the original śruti-smṛti, but you have to take the timely recommendation. Just like Kṛṣṇa Caitanya Mahāprabhu said, harer nāma harer nāma harer nāmaiva kevalam, kalau nāsty eva nāsty eva nāsty eva... (CC Adi 17.21). This is the only method. You take it. But this is śruti-smṛti-pramāṇa.
Puṣṭa Kṛṣṇa: Then they say that if this is the method, then how does Deity worship fit into the scheme?
Prabhupāda: You can avoid even Deity worship, but you cannot avoid chanting.
Devotee: Their idea is to abolish Deity worship. They consider it antiquated.
Prabhupāda: If you want... If you want... Why you should try to avoid this? That means you are disregarding the śruti-smṛti. But that is not the policy, that you should avoid it. But if you..., it is not possible... Just like it is not possible to introduce the Deity worship everywhere, anywhere. It doesn't matter. You chant Hare Kṛṣṇa. It is not avoiding. It is the circumstance that does not make very favorable. Just like I did not introduce the Deity worship in the beginning. That was not possible. But when there is favorable condition we introduced. That is not avoidance. That is conditional. But especially chanting, that is possible in any condition of life. That is possible.