Once, long back I was preaching in South Africa at a university, and somebody said, “I’ve realised the truth!” and he pointed to his head. There was a new devotee with me at the time and I told him, “If he had said, ‘I’ve realised the truth!’ and pointed to his heart, that would have been a little closer to reality.”
The truth is not a ‘head-thing’ – it’s a ‘heart-thing.’ Not the organ, but in that region. Its in the heart because consciousness is more acutely felt in the heart. The core of our being is where the truth will appear, not just in our head, in our brain! It is very, very difficult to understand Kṛṣṇa through the head! The head, the brain is just a material element.