Where is Kṛṣṇa? Kṛṣṇa Himself says He is in the hearts of His devotees.
Once, someone asked Śrīla Śrīdhara Mahārāja, “Where is Vṛndāvana? It is said that Kṛṣṇa never leaves Vṛndāvana – where is Vṛndāvana?”
Then Śrīla Śrīdhara Mahārāja said, “Where is Vṛndāvana? Vṛndāvana is that place where we find the footprints of Śrīmatī Rādhārāṇī.”
In other words, the Supreme Entity of Vṛndāvana is Vṛndāvaneśvarī, Śrīmatī Rādhārāṇī. Kṛṣṇa never leaves Vṛndāvana because Rādhārāṇī is always in Vṛndāvana. So he said, “Vṛndāvana is where we find the footprints of Śrīmatī Rādhārāṇī.” Then he said, “I’ll give you one more hint…the Vaiṣṇavas carry the footprints of Śrīmatī Rādhārāṇī on their heads.”
So in this way, the devotees are given such importance…association with the devotees. By association with the prema-bhaktas, the Lord’s eternal servants, then we come in touch with that divine nectar of prema.