Yoko Ono: Well, milk is material.
Prabhupāda: No, material. You want to understand through your material senses, we have to give...
Yoko Ono: Well, no. I don't have, you don't have to tell me material senses. I mean mantra is not material. It should be something spiritual, and therefore nobody can spoil it, I don't think. I mean, I wonder if anybody can spoil something that is not material.
Prabhupāda: But the thing is that if you don't receive the mantra through the proper channel, it may not be mantra.