So how Kṛṣṇa consciousness acts, how this transcendental sound cleanses your heart, you may not understand in the beginning, but if you take to it and if you practice it, then you understand. Then you can understand. And in the Vedānta-sūtra it is said, śabdāt anāvṛttiḥ. As from the sound the whole material existence has come into being, similarly, from sound also, you can go back to the spiritual existence.
So this sound vibration . . . the oṁkāra is also the same sound as . . . oṁ, but this is easier, Hare Kṛṣṇa. You cannot have so ecstasy by vibrating oṁ, but because it was chanted by the greatest authority, Lord Caitanya, it has got special power. Mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186). The scriptures indicates that we have to follow the footprints of great authorities. Tarko apratiṣṭham. You cannot come to the right conclusion simply by arguing. You may be a very good logician and you can argue very nicely, but another man, he may be a greater logician than you; he can nullify all your arguments. There is possibility. So tarko apratiṣṭhaḥ.
Therefore simply by argument and logical conclusion, you cannot approach to the Absolute Truth, or real truth. Tarko apratiṣṭhaḥ śrutayo vibhinnāḥ (CC Madhya 17.186). And if you consult yourself scriptures . . . just like Bhagavad-gītā, if you read yourself, you get one kind of impression, and if you hear explanation from an authorized person, you get another impression. The book is the same, but by hearing from the authorities, you get a better impression, better understanding. There are so many examples like this. Tarko 'pratiṣṭhaḥ śrutayo vibhinnāḥ.