Kṛṣṇa is present in His Goloka Vṛndāvana, in His dhāma. He does not go out, but His expansion goes out and takes, accepts the service of the devotee. This is the . . . bhagavat-tattva-vijñānam (SB 1.2.20). One should understand the bhagavat-tattva-vijñānam. It is a science, how He takes . . . we have got our limited sense that, "I am sitting here." If you offer my foodstuff some yards off from me, I cannot reach, because I am limited. But Kṛṣṇa can expand His hand. He Himself comes. Svayam eva sphuraty adhaḥ (Brs. 1.2.234). Kṛṣṇa becomes manifest to the devotee.
Ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ, sevonmukhe hi jihvādau (CC Madhya 17.136). When one becomes devotee, beginning from the tongue, jihvādau, by chanting Hare Kṛṣṇa mantra, sevonmukhe hi jihvādau, svayam eva sphuraty adhaḥ, He becomes revealed. Yei nāma sei kṛṣṇa. That is the perfection of chanting without any offenses. Then you'll find the name is not different from Kṛṣṇa. When you are chanting, you'll find Kṛṣṇa is dancing on your tongue. This is the conclusion.
So we have to learn how to chant. Therefore in the śāstras, in the Purāṇas, the ten kinds of offenses are described, and Śrīla Jīva Gosvāmī has given very much stress to avoid these offenses. Śuddha-nāma. In the beginning we cannot chant pure form of the name, because we are accustomed . . . but still, by chanting process, then it becomes nāmābhāsa, almost pure. Ābhāsa means just like before sunrise, you find the darkness is off, but it is not sunlight. It is different from sunlight, but still, there is the dawn, you can see everything distinctly.