Total absorption in hearing Sankirtana Music develops faith in Lord Krishna.
When we face difficulties and still remain faithful to Krishna and the spiritual master, we access the infinite mercy of their hearts.
Only to those great souls who have implicit faith in both the Lord and the spiritual master are all the imports of the Vedic knowledge automatically revealed.
To the extent the heart is polluted with sins, it cannot place its faith in the vedic scriptures or the bonafide spiritual master.
Feed your faith, your doubts shall starve to death.