The Supreme personality of Godhead is not partial to some and neutral to others. One can actually draw the attention of the Supreme Personality of Godhead by service. Then one is further empowered by the Lord to act in such a way that everyone can appreciate his service. This is confirmed in the Bhagavad-gita (4.11): ye yatha mam prapadyante tams tathaiva bhajamy aham. Krsna is responsive. If one tries to render his best service to the Lord, the Lord gives him the power to do so. Krsna also says in the Bhagavad-gita (10.10):

"To those who are constantly devoted and worship Me with love, I give the understanding by which they can come to Me." Sri Caitanya Mahaprabhu bestowed His special favor upon Srila Rupa Gosvami because Rupa Gosvami wanted to serve the Lord to the best of his ability. Such is the reciprocation between the devotee and the Lord in the discharge of devotional duties.