We have to prepare our mind in such a way that we should always think of Kṛṣṇa. Then that is meditation, real meditation. And practical. There is no use thinking of something void. That you cannot concentrate. That is not practical. You can simply struggle for it and waste your time. But if you have got something tangible to meditate, that is very easy. So why not Kṛṣṇa? So nice, beautiful, and He's accepted the Supreme Personality of Godhead by great sages, saintly persons, scholars and Vedic literature. And they have achieved success. Why not follow their example and simply concentrate your mind, meditate on mind?
And that meditation is very nicely done by chanting. As soon as you chant Hare Kṛṣṇa, your ear is forced to receive this Kṛṣṇa. And the Kṛṣṇa sound and Kṛṣṇa is nondifferent. This is the philosophy. Kṛṣṇa and Kṛṣṇa sound . . . because Kṛṣṇa is everything, God is everything, so why not this sound, "Kṛṣṇa," which is approved? So by chanting Kṛṣṇa, you receive Kṛṣṇa in transcendental vibration immediately, and your meditation is there because your attention is diverted to Kṛṣṇa. So your attention, your mind and the word and the authority—everything is there. Simply chant Hare Kṛṣṇa and take . . . feel practically how it is working. There is no charge. There is no exertion. It is very easy. Kartum . . . su-sukhaṁ kartum avyayam (BG 9.2).
This process of meditation is easy, happy and indestructible. There are so many instances from śāstras. Nāma cintāmaṇiḥ kṛṣṇaś caitanya-rasa-vigrahaḥ, abhinnatv an nāma-nāminoḥ (CC Madhya 17.133). There is the spiritual platform, everything identical. Just like you get some thousand miles away in the radio: this sound and the person who is transmitting the sound is identical, although materially we cannot derive the same benefit. That is the difference between material sound and spiritual sound. The spiritual sound, there is no such difference. Nāma cintāmaṇiḥ kṛṣṇaś caitanya-rasa-vigrahaḥ. So it is a fact that by sound vibration, Kṛṣṇa, you immediately contact Kṛṣṇa.
So if there is any spiritual benefit by contacting Kṛṣṇa or be in touch in Kṛṣṇa . . . just like if you be in contact with fire you get warm, similarly, by contact with Kṛṣṇa you immediately get spiritual warmth. That is the technique of this chanting Hare Kṛṣṇa. And that is being experienced by the students, those who are sincerely doing it without any offense.