Prabhupāda: Tarko apratiṣṭhaḥ śrutayo vibhinnaḥ. Neither by reading so many books, because each book is written in a different way. Tarko apratiṣṭhaḥ śrutayo vibhinnaḥ nāsau munir yasya mataṁ na bhinnam (CC Madhya 17.186). If you consult philosophers, then everyone will give you a different opinion.
Impersonalist: They could be saying the same thing, even though they are saying different things.
Prabhupāda: Maybe same thing, but you will be puzzled by the different opinion. Therefore you have to take the path of great personalities. So we are following Lord Caitanya. Lord Caitanya chanted this Hare Kṛṣṇa mantra. So we are following, and we are getting result. That's all. We don't manufacture our own way, because we are imperfect. We cannot manufacture. That will not be beneficial.
Impersonalist: Why is it that this mahā-mantra is so attractive to Western countries and not particularly . . .
Prabhupāda: Because it is the thing required. Therefore it is recommended in the śāstra. Because it is recommended that . . . what is recommended in the śāstra, spoken in the śāstra, that is perfect. There is no mistake. Therefore it is being accepted. Anywhere we are going, beginning from old man to child, everyone chants Hare Kṛṣṇa. Therefore it is recommended. Our intelligence should be applied there, that what is recommended in the Vedas, that is perfect.
There are so many instances. Just like cow dung. You know cow dung? Stool of the cow? So according to Vedic principle, if you touch stool of an animal you become impure. Even my stool, I pass in the WC, and immediately I wash and become purified. Oh, this is my stool, personal, and what to speak of other stool? So stool is impure.