Usually God is seen as the almighty Father who supplies the demands of His sons. The great devotees, however, sometimes treat God as a son in their execution of devotional service. The son demands, and the father supplies, and in supplying Kṛṣṇa the devotee becomes like a father. Instead of taking from God, we give to God. It was in this relationship that Kṛṣṇa's mother, Yaśodā, told the Lord, "Here, eat this or You'll die. Eat nicely." In this way Kṛṣṇa, although the proprietor of everything, depends on the mercy of His devotee. This is a uniquely high level of friendship in which the devotee actually believes himself to be the father of Kṛṣṇa.
However, Lord Caitanya's greatest gift was His teaching that Kṛṣṇa can be actually treated as one's lover. In this relationship the Lord is so much attached that He expresses His inability to reciprocate. Kṛṣṇa was so obliged to the gopīs, the cowherd girls of Vṛndāvana, that He felt unable to return their love.