Is Krishna partial?
“To those who are constantly devoted and who worship Me with love, I give the understanding by which they can come to Me.” This is very practical. A teacher instructs the student if the student is capable of taking more and more instructions. Otherwise, in spite of being instructed by the teacher, the student cannot make strides in his understanding. This has nothing to do with partiality. When Krsna says tesam satata-yuktanam bhajatam priti-purvakam. dadami buddhi-yogam tam, this indicates that Krsna is prepared to give bhakti-yoga to everyone, but one must be capable of receiving it. That is the secret. Thus when a person exhibits wonderful devotional activities, a thoughtful man understands that Krsna has been more favorable to this devotee.
Srimad Bhagavatam 7.1.9 purport