Here in Mayapur, we have the Bhakti-sastri program. I have heard from so many devotees who have studied Bhakti-sastri here in the holy atmosphere of the dhama that their lives were transformed by three or four months of daily full time study of Srila Prabhupada books. They said it just turned their whole life around.
Why? Your life will become transformed one way or another when you deeply accept the principles, these sacred principles of sastra, Bhagavad-gita, Srimad Bhagavatam. You have to think about these things and allow your head and your heart to be challenged. That is how you experience spiritual growth. Srila Prabhupada was expert at doing that on his morning walks. He would challenge your conceptions, he would challenge your assumptions, and then he would insert the real knowledge that Lord Krishna gives.