teṣāṁ satata-yuktānāṁ bhajatāṁ prīti-pūrvakam dadāmi buddhi-yogaṁ taṁ yena mām upayānti te

"To those who are constantly devoted and worship Me with love, I give the understanding by which they can come to Me." (Bg. 10.10) Sri Caitanya Mahaprabhu bestowed His special favor upon Srila Rūpa Gosvami because Rūpa 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.