In the Bhakti-rasāmṛta-sindhu (1.3.1), love of Godhead is compared to sunshine, and this shining makes the devotee's heart more and more lovely. The heart of such a devotee is situated in a transcendental position, beyond even the material mode of goodness. As the devotee's heart becomes increasingly sterilized by the sunshine of love, he attains a state called bhāva. This is the description of bhāva given by Rūpa Gosvāmī. Bhāva is the permanent characteristic of the living entity, and the crucial point of progress for bhāva is called the marginal state of love of Godhead. When the bhāva state becomes deeper and deeper, learned devotees call it love of Godhead.
Teachings of Lord Caitanya | Chapter 13