Dadami buddhi yogam tvam

I am performing bhakti in tamo guna. So Krishna does not favour me, otherwise I would not be the way I am. By seeing the activities of the human one can see how much the person has advanced in spiritual life. Just when I was feeling morose that Krishna does not favour me for some unknown reason - I read this:

In Bhagavad-gītā (10.10) the Lord also says:

teṣāḿ satata-yuktānāḿ

bhajatāḿ prīti-pūrvakam

dadāmi buddhi-yogaḿ taḿ

yena mām upayānti te

[Bg. 10.10]

"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 Kṛṣṇa says teṣāḿ satata-yuktānāḿ bhajatāḿ prīti-pūrvakam/ dadāmi buddhi-yogaḿ tam [Bg. 10.10], this indicates that Kṛṣṇa 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 Kṛṣṇa has been more favorable to this devotee.

This is not difficult to understand, but envious persons do not accept that Kṛṣṇa has bestowed His favor upon a particular devotee in accordance with his advanced position.

http://vedabase.net/sb/7/1/9/en