Prabhupada's lecture -Śrīmad-Bhāgavatam 1.8.39 - Los Angeles, May 1, 1973
So what is fact now, what is, what was fact before, during five thousand years ago when Pāṇḍavas were there, that Kṛṣṇa in the center, everything becomes beautiful—that can be done at any time. Kṛṣṇa is always there. Simply you have to invite Him, "My Lord, please come and be in the center." That's all. Everything will be beautiful. The same example, sometimes as I give you, that there are zero... Zero has no value. But you bring one by the side of zero, it becomes ten times beautiful, immediately. So our point is that you do whatever you are doing. We don't stop you.
We never say that "Stop everything of material..." But we have to stop anything which is against Kṛṣṇa consciousness. Because we do not stop, it doesn't mean that we shall not stop meat-eating. We must stop. This is against advancement in Kṛṣṇa consciousness. You cannot commit sinful activities. Kṛṣṇa says, ahaṁ tvāṁ sarva-pāpebhyo mokṣayiṣyāmi [Bg. 18.66]. Kṛṣṇa says that "You surrender unto Me and I shall rescue you, make you liberated from all kinds of sinful reactions."